In briefDynamics of Fock states in traveling pulses
SummaryThis paper studies how the quantum state of a traveling light pulse changes the excitation dynamics of a two-level atom, comparing coherent and Fock input states. Coherent pulses produce damped Rabi oscillations, while Fock pulses show partial recovery of oscillation amplitude in the trailing part of the pulse. The authors examine the roles of an auxiliary temporal mode and radiative loss, and connect the effect to stimulated Raman adiabatic passage.
Vasil Z. Vasilev, Benedetto Militello, Anna Napoli et al.
In briefSpin SYK-dot chains: entanglement bound and resource estimates for quantum advantage
SummaryThis paper studies a chain of dense SYK dots linked by single ZZ bonds, a model whose ground states are highly entangled. It gives an upper bound on entanglement across any cut and estimates the dot size at which a quantum advantage could appear. The estimate suggests dots of roughly 15 to 21 qubits or more, with two-qubit error rates near 10^-6 needed per Trotter step. Numerical tests with imaginary-time matrix product states and variational circuits support these assumptions.
In briefUniversal growth and classical-like dynamics of Krylov complexity
SummaryThis paper studies how Krylov complexity grows linearly at late times in many systems. It gives a general spectral formula for the leading growth coefficients of Krylov complexity and its higher moments, without needing detailed Lanczos coefficients. For states with narrow energy distributions, dynamics in the Krylov basis resembles motion along a classical trajectory. The results are demonstrated for the critical XY chain and double-scaled SYK, where chord-number moments are computed through one-loop order.
In briefControlling a macroscopic free mass via continuous quantum measurement
SummaryThe paper realizes a suspended 1-milligram rotor operating in the free-particle regime with strong environmental isolation. The researchers directly resolve thermal fluctuations in its motion, with a damping rate of only 7 nHz. Through continuous quantum measurement, they localize the otherwise unconfined motion, obtaining conditional states with entropic temperatures as low as 140 nK.
WhyThe authors report controlling a 1-milligram suspended rotor in the free-particle regime via continuous quantum measurement, reaching 140 nK and applying it to tests of quantum gravity.
Umang Mishra, Teodor Str\"omberg, Gabriela Valencia-Guzman et al.
In briefCorrelated catalysis eliminates the strong converse in entanglement distillation
SummaryThis paper studies entanglement distillation, which converts noisy shared quantum states into maximally entangled pairs using local operations and classical communication. It shows that correlated catalysis removes the strong converse for every distillable bipartite state. At any target rate above the distillable entanglement E_D, the optimal asymptotic fidelity equals E_D/R.
WhyThe authors report that correlated catalysis removes the strong converse, giving optimal fidelity E_D/R above the distillation rate.
In briefBelief-propagation-guided Tesseract decoding for quantum LDPC codes
SummaryThis paper proposes a faster version of the Tesseract decoder, a search-based method for quantum error correction. Damped belief propagation is run before the search, and its hard decision is accepted directly when it matches the triggered detectors, skipping the search. Otherwise, BP marginal estimates adjust the search priority. Evaluated on bivariate bicycle codes under circuit-level noise, the method reduces expanded search nodes by up to more than two orders of magnitude at low physical error rates while keeping the logical error rate close to Tesseract's.
Sana Javed, Francisco Garcia-Herrero, Bane Vasi\'c et al.
In briefMany-Body Correlations in Phase-Space Microscopes: A study of a new quantum gas microscope that measures position and momentum together, to probe correlations in strongly interacting quantum matter.
SummaryThe paper examines the recently proposed phase-space microscope, which measures position and momentum jointly in a single shot. The authors show that n-body correlation functions built from these snapshots can in principle determine all n-body observables of a many-body quantum state. Applications include witnessing entanglement hidden from both position and momentum, resolving pairing structure across the BEC-BCS crossover, and measuring the local Chern marker.
In briefPhysical origin of the Berry connection for free relativistic electrons
SummaryThis paper addresses the unresolved question of which operators correctly describe the spin and orbital angular momentum of free relativistic electrons, and challenges the belief that a spin-orbit coupling arises through the Berry connection. The authors argue that only observables projected onto the positive-energy subspace of the Dirac equation represent physical electron quantities. They conclude that the Berry connection describes the position of a quantum reference point relative to the laboratory frame.
In briefSecond-order mean force Gibbs state of fermionic open systems: a paper deriving the equilibrium state of fermionic systems coupled to a reservoir, checked against exact numerics.
SummaryThe paper derives the grand canonical mean force Gibbs (MFG) state for a generic fermionic system coupled to a thermal reservoir at arbitrary chemical potential, to second order in the coupling. It uses the mode reduced state to make the fermionic MFG state well defined and splits the correction to the bare Gibbs state into particle and hole channels. The results are applied to the resonant level model, two modes sharing a reservoir, and the single impurity Anderson model, and checked against numerically exact and real-time dynamical calculations.
WhyThe authors derive a second-order grand canonical mean force Gibbs state for fermionic systems and compare it with numerically exact and real-time results.
In briefNonreciprocal Bell-state generation via cooperative dissipation in a qubit-magnon system
SummaryThis paper proposes a scheme for generating Bell states nonreciprocally in a system of a superconducting qubit and a magnon-hosting yttrium iron garnet sphere. Both are coupled to a shared waveguide, producing cooperative dissipation that creates a dark eigenstate in the single-excitation subspace. Reversing the bias magnetic field makes this dark state correspond to a different Bell state. A fidelity-based nonreciprocal rate is defined to quantify the effect.
In briefGenerating needle-shaped beams from SPDC photons with flat, inverse-designed optics
SummaryThe study uses a compact inverse-designed multilevel diffractive lens to produce needle-like beams from spontaneous parametric downconversion light. A heralded three-detector measurement before the lens confirms the nonclassical nature of the source, with a zero-delay second-order correlation of about 0.14. Under collinear illumination, the lens keeps the focus tightly confined over about 11 mm, showing less diffraction broadening than a conventional plano-convex lens.
In briefeigenkit: A Provider-Neutral Quantum Computing Library
SummaryThis paper introduces eigenkit, a quantum computing library that separates algorithm definition from backend execution through a common circuit representation and provider interface. It supports 12 execution providers, including simulators and quantum hardware, and integrates with NumPy, PyTorch, and scikit-learn. Experiments on IBM Heron and IQM Emerald show that the better processor for a given algorithm depends on how well the algorithm's topology matches the processor's physical connectivity.
Laia Domingo, Daniil Tarpanov, Arsenii Senokosov et al.
In briefUsing pulse sequences to boost group light emission from mixed quantum emitters
SummaryThis paper studies how a periodic pulse sequence can strengthen cooperative behavior in a group of quantum emitters that have different spectral frequencies. The authors combine a semi-analytical mean-field solution with a digital quantum simulation to examine coherence and emitted intensity versus spectral disparity, time, atom number, and inter-pulse delay. They report clear signs of enhanced cooperative dynamics when enough pulses suppress dephasing during an emitter's lifetime. This suggests externally applied control fields as a tuning method for ensemble dynamics after fabrication.
Vincent P. Iglesias-Cardinale, Shreekanth S. Yuvarajan, and Herbert F. Fotso
In briefRouting Strategies for High-Rate Error Correction on Spin Qubits
SummaryThis paper studies how to implement qLDPC quantum error correction codes on silicon spin qubits by shuttling qubits next to each other when they need to interact. It analyzes memory experiments of the [[144,12,12]] Gross code on square and diagonal-augmented grids, comparing three shuttling strategies, initial layouts, and shuttling noise models. The best strategy minimizes the longest distance travelled rather than the total distance.
Merlin Incerti-Medici, Minh T. P. Nguyen, Stefano Bosco et al.
In briefExplicit lossless expanders and good quantum codes with full-rank checks.
SummaryThe paper constructs explicit two-sided lossless expanders whose binary adjacency matrices have full rank. Using a free action of a finite 2-group, it obtains asymptotically good quantum LDPC codes whose X- and Z-check matrices have full row rank and satisfy small-set soundness. The construction also yields Ramanujan Cayley graphs on 2-groups by reducing LPS Ramanujan graphs modulo powers of 2. Applied within the Hong, Guo, and Lucas framework, the codes give quantum memories with improved guaranteed lifetime.
Yali Aharon-Holzman, Michael Ilan, Assaf Reiner et al.
In briefProbing multiphoton transitions between dressed states in a strongly driven Jaynes–Cummings system with quantum-nondemolition readout
SummaryThis paper studies the spectroscopy of the Jaynes–Cummings model, which describes a qubit coupled to a cavity, under strong driving in circuit quantum electrodynamics. The authors separate the strong cavity drive from qubit readout, which substantially improves measurement sensitivity compared with conventional cavity-transmission spectroscopy. They identify near-resonant features as multiphoton transitions between dressed states of the same parity and resolve transitions between dressed states of opposite parity. Away from resonance, selective enhancement and suppression of multiphoton transitions are also observed.
In briefAI scientists reimagining computational quantum research, a study on automating the reproduction of quantum papers.
SummaryThe paper introduces OmniQ, an expert-audited environment that turns 59 published computational quantum studies into executable reproduction tasks. It finds that current AI scientist systems often fail to reproduce published results, while human expert input can turn these failures into successful reproductions. The authors present Residual Agents, a self-improving system that stores verified workflow repairs, and integrate the reproduced results into a platform built on the model context protocol.
In briefunitaryQIP = unitaryPSPACE: equality of two unitary synthesis complexity classes
SummaryThis paper studies the computational cost of applying a target unitary to an unknown quantum state. It proves that the unitary complexity classes unitaryQIP and unitaryPSPACE are equal, an analogue of the earlier QIP=PSPACE and stateQIP=statePSPACE results. The authors also show the protocol can be parallelized to constant rounds when the verifier receives polynomially many input copies, and identify a complexity-theoretic barrier to proving the existence of EFI pairs.
WhyThe authors extend QIP=PSPACE to unitary synthesis, proving unitaryQIP=unitaryPSPACE via an acceptance rigidity lemma and a PSPACE-oracle synthesis construction.
In briefCoulomb blockade in a one-dimensional array of strong Josephson junctions
SummaryThe study measures current in a voltage-biased long array of Josephson junctions. The current-voltage curves show no critical current but instead a threshold voltage and finite activation energy, consistent with Coulomb blockade. The energy scale is much smaller than a single island's geometric capacitance predicts, which the authors attribute to strong quantum charge fluctuations from a large Josephson energy.
In briefQuantized pumping of boundary Hilbert space in chiral Floquet phases
SummaryChiral Floquet phases carry quantized chiral flow along their boundaries even when the bulk is fully localized. This paper identifies a related effect, called Hilbert-space pumping, in which a quantized-dimension part of the boundary Hilbert space moves between opposite boundaries under a time-translation-twisted boundary condition. For noninteracting fermions the number of transferred modes is set by the winding number, and for interacting systems with quantum cellular automaton boundary dynamics it is set by the GNVW index.
In briefSingle-port homodyne detection achieves optimal multiphase sensing in a ring cavity
SummaryThis paper studies estimating the n internal phases of a lossless n-port ring cavity simultaneously, probed by a fixed-energy multimode coherent state. It gives a necessary and sufficient condition for the global optimum: equal energy distribution among the ports and a phase-matching condition for each port. At this optimum the quantum Fisher information matrix is full rank, and balanced homodyne detection at each output port attains the optimal Fisher information.
Jiayu He, Aviral Kumar Pandey, Krishna Mohan Mishra et al.
In briefInferring entanglement from quantum-eraser measurement records
SummaryThe paper determines the minimum entanglement compatible with quantum-eraser data when the preparation may be mixed. For noisy GHZ states it gives sharp entanglement-depth thresholds with matching converses, and it shows how parity information strengthens certification. For an ideal three-qubit eraser, it classifies the additional marker measurement directions that certify genuine multipartite entanglement.
In briefQuantum teleportation with photon-added versus photon-subtracted two-mode squeezed Fock states
SummaryThis paper studies how adding photons to a two-mode squeezed Fock state affects its performance in Braunstein-Kimble quantum teleportation. The authors compare teleportation fidelity gains of the photon-added state with those of a photon-subtracted counterpart, accounting for the success probabilities of both operations. They find that photon subtraction performs better, with the advantage larger when success probability is included, and that symmetric (1,1) photon subtraction gives the best balance between fidelity and success probability.
In briefPerformance of cat and GKP state generation using squeezed single-photon inputs
SummaryThis paper analyzes optical protocols that generate cat states and GKP grid states by homodyne breeding, using squeezed single photons as seeds. For a symmetric tree of seeds, the heralded resource state is shown to be close to the desired squeezed-cat resource, with closed-form even-cat fidelities and a rule for choosing seed squeezing. The resources are then applied to GKP breeding, with practical imperfections such as finite homodyne windows and photon loss also examined.
In briefModelling NV⁻ spin-echo decoherence in nitrogen-rich diamond with a dynamical mean field
SummaryThe paper studies the Hahn-echo coherence time T₂ of NV⁻ centres in nitrogen-rich diamond. The authors replace the frozen mean field of surrounding P1 centres with a dynamical one, where pairs of P1 centres flip-flop while conserving total Sz, with rates from the dipolar Hamiltonian via kinetic Monte Carlo. At 30 mT this lowers T₂·[N] from 264 to 188 μs ppm, closer to experiment, without dark spins.
WhyThe authors propose a dynamical mean field for CCE that replaces the frozen field, reporting parameter-free agreement with experiment at 10 and 30 mT and a remaining low-field discrepancy.
In briefLogarithmic Bias in Zero-Noise Extrapolation Under 1/f Noise
SummaryThis paper analyzes errors in zero-noise extrapolation when time-local Markovian noise and stationary finite-band 1/f noise are present together. The authors derive the response of complete multiqubit gate folding, which contains an r² ln r term, and show that ordinary polynomial extrapolation leaves a calculable bias from it. They propose response-matched extrapolation, including a log-domain implementation, that cancels this contribution, and give explicit bounds on the remaining errors.
In briefBarycentric programming: classical programs for universal quantum processors
SummaryThe paper introduces barycentric programming, which stores the label of a unitary chosen randomly from a finite set, with probabilities set so that first-order approximation errors cancel in the averaged channel. As a result, the diamond-distance error scales quadratically with the discretization spacing. For ν-parameter unitary families forming a compact smooth manifold without boundary, the method achieves error ε using (ν/2)log₂(1/ε)+O(1) classical bits. The authors also prove a matching lower bound for arbitrary quantum programs.
WhyThe authors introduce barycentric programming, using randomized classical labels to cancel first-order errors and match the optimal leading-order program size, with a matching lower bound.
In briefWhether and how fast the regularized quantum channel relative entropy can be computed
SummaryThe paper studies when the regularized quantum channel relative entropy is attained at finite blocklength and how efficiently it can be approximated. It shows a dichotomy: the value is either attained at the single-copy level or never attained at any finite blocklength, and a simple two-copy additivity test distinguishes the two cases. The authors also give explicit convergence rates for approximating the regularized value and a semidefinite hierarchy yielding a certified polynomial-time approximation.
WhyThe authors establish a dichotomy for finite attainment of regularized channel relative entropy, a two-copy additivity test, and explicit convergence rates.
In briefNear-transform-limited pulse-like timing and narrowband spectra from sum-frequency generation with bright twin beams
SummaryThis paper simultaneously measures the timing and spectral behavior of the coherent part of bright twin beams using spectrally resolved, delay-dependent sum-frequency generation. The measured temporal correlation width is 0.138 ps, close to the 0.126 ps transform-limited value estimated from the twin-beam spectrum. The spectral correlation width is 0.176 rad/ps and is limited by spectrometer resolution. The time-frequency width product is 0.0243, far below the value of 1 expected for sum-frequency generation between two independent transform-limited Gaussian pulses.
In briefQuantum state synthesis using an NP oracle
SummaryThis note presents a quantum algorithm that prepares an arbitrary state to inverse exponential precision in polynomial time using queries to an NP oracle, assuming direct access to entries of the state vector. The previous best upper bound on the required oracle complexity class was PP. The paper shows that any quantum algorithm with a P/poly oracle needs exponentially many queries, suggesting NP is the best possible upper bound.
WhyThe authors improve the oracle complexity upper bound for arbitrary state preparation from PP to NP, and report an exponential query lower bound for P/poly oracles.
In briefQuantum simulation of damped sound and elastic waves with absorbing boundaries and compact quantum circuits
SummaryThis paper simulates acoustic and elastic wave equations on a quantum computer while opening the domain with a graded sponge layer that damps waves near the outer edge. It uses Schrödingerisation to convert the non-unitary damped evolution into unitary evolutions via one auxiliary variable, deriving the full chain from partial differential equation to circuit in one, two and three dimensions. The authors report that damping all wave fields absorbs better than velocity-only damping, and that the damping step factorises exactly into polynomially many multi-controlled phase gates. Gate-level simulations on up to 25 qubits agree with classical solutions of the damped wave equations.
In briefMBUndo: Automatic, Sound, Efficient Measurement-Based Uncomputation for Quantum Circuits
SummaryThis paper addresses how quantum programs reset temporary ancilla qubits to zero, a step called uncomputation. It replaces costly unitary T gates with cheaper measurements and phase corrections, a technique called measurement-based uncomputation. The authors present a static analysis that finds where measurement is safe for each ancilla and circuit transformations that convert unitary uncomputation gates into phase corrections. Their compiler pass MBUndo reduces T gates by more than 36.5% across 22 benchmarks compared with existing uncomputation synthesizers.
In briefAchieving CSS code limits over Pauli channels with bounded graphical complexity
SummaryThis paper constructs ensembles of Calderbank-Shor-Steane (CSS) quantum codes whose rates approach the CSS limit over memoryless Pauli channels under maximum-likelihood decoding, while keeping sparse, bounded-degree graphical representations. The approach separates parity-check density from graphical complexity by representing dense components through sparse concatenated factor graphs. The authors first analyze LDPC and LDGM component code combinations numerically, then introduce a second construction using concatenated LDPC, LDGM, and GIRA codes. They use the Miller-Burshtein framework to prove simultaneous reliability of the two CSS decoding components.
WhyThe authors construct concatenated LDPC, LDGM and GIRA CSS ensembles that approach the hashing bound with bounded graphical complexity.
Gulnihal Mercanoglu, Achilleas Anastasopoulos, and S. Sandeep Pradhan
In briefShallow circuits for loading multivariable functions into quantum states
SummaryThe paper builds shallow quantum circuits, namely QROM, diagonal block-encoding, and state preparation oracles, for analytic functions on the D-dimensional hypercube [0,1]^D. Using n qubits and achieving error 2^{-Ω(n/D)}, the circuits reach depth O(√(n log₂(n)/D)) in the Clifford+T gate set. This requires 2^{O(√(nD log₂(n)))} ancilla qubits, and the depth is a near-quadratic reduction over known linear-depth methods.
In briefProbing non-adiabaticity in a quantum Otto cycle via quantum texture and imaginarity
SummaryThis paper studies the non-adiabatic inner friction produced when a two-level quantum system is driven unitarily in finite time. The authors combine two resource-theoretic measures, quantum texture (rugosity) and imaginarity, into a combined witness that is non-negative and vanishes only for quasi-static driving. Applied to a finite-time quantum Otto refrigerator, it yields an exact closed-form relation between the coefficient of performance and these two quantities. The authors also report that local minima of the witness identify the operating regimes that maximize cooling performance.
In briefThe Reference System Loophole: a paper on a gap in Extended Wigner's Friend theorems
SummaryThis paper argues that Extended Wigner's Friend theorems contain a previously unnoticed loophole, arising because measurement outcomes typically need a reference system to have meaning. The author shows how the loophole can preserve quantum mechanical predictions in the Local Friendliness theorem without denying Local Friendliness, and responds to some objections. The loophole is further claimed to apply to any Wigner's Friend experiment and to other Extended Wigner's Friend theorems.
In briefAngular-momentum pumping by moving charges via chirality
SummaryThe paper proposes a mechanism for chirality-induced spin selectivity in which injected electron wave packets coherently emit chiral phonons. Competition between electronic absorption and phonon decay sets the fraction of electrons receiving the effect and its temperature dependence. The authors state that spin-orbit coupling is not renormalized but becomes effectively large because Coulomb correlations enhance the orbital and spin moments it couples.
In briefQubrio: Faster, More Accurate Quantum Compilation Using Teams of AI Agents
SummaryThe paper presents Qubrio, a framework that uses multiple large language model agents to compile quantum programs, reducing the need for manual redesign of compiler rules when hardware changes. It splits programs into sequential stages and assigns specialized agents to placement, routing, and optimization, with feedback used for error correction. On realistic workloads, it improves hardware runtime and program fidelity over the state-of-the-art PowerMove compiler, and its code is publicly available.
In briefLieb-Robinson bounds for Bose-Hubbard models via path expansions
SummaryThis paper studies transport in Bose-Hubbard-type Hamiltonians. It gives shorter proofs of known bounds on particle transport and Lieb-Robinson velocity, using weighted extended particle number operators and a bosonic path-expansion method. The transport bounds are also extended to long-range hopping with power-law exponents above the lattice dimension.
In briefQuantum Temporal Marginal Problem: whether partial multi-time experiments can come from one quantum process
SummaryThis paper asks whether partial measurement results from a quantum process at selected times can come from one common underlying process. The authors formulate this process tensor marginal problem as a semidefinite feasibility test. They show that agreement on overlapping times is not sufficient, and quantify incompatibility by the mixing needed to restore compatibility.
WhyThe authors formulate a process tensor marginal problem as an SDP, report that local consistency is insufficient, and show incompatibility equals a discrimination advantage.
In briefHow quantum relationality relates to symmetry-based relationality
SummaryThe paper examines whether the relationality in quantum mechanics and the relationality in relativistic physics are fundamentally the same. It proposes that quantum states describe degrees of freedom that can be changed by a symmetry transformation, so they are relativized for the same reason as partial observables in general relativity. The author argues this hypothesis is consistent with existing empirical evidence and considers its implications for debates about the nature of quantum measurement.
In briefInverse-designed silicon photonic beam splitters and how fabrication errors affect quantum protocol yield
SummaryThis paper uses adjoint-based inverse design to create compact 1×2 Y-splitters and 2×2 directional couplers for silicon spin-photon qubits at 1326 nm and 1482.44 nm. It evaluates fabrication variations such as etch bias, line-edge roughness, thickness, and refractive-index changes using 100-realization Monte Carlo simulations. The authors conclude that the tolerance of the target quantum protocol, rather than the device alone, sets the fabrication requirement for these beam splitters.
In briefSound-wave interference reveals the symmetry of a quantum transition
SummaryA single sound quantum emitted from two locations interferes with itself, and the fringe position shows whether the two sources emit with the same or opposite signs. Researchers measured single phonons emitted as a hole tunnels between two gallium arsenide quantum dots. They found the emission is mainly antisymmetric, with only a small symmetric part. This antisymmetric emission is predicted to strongly reduce phonon losses for qubits at their operating frequencies.
Sergei Studenikin, Yousef Karimi Yonjali, Alex Bogan et al.
In briefClassical and quantum dynamics in projective Hilbert space, measurement, and classical emergence
SummaryThe paper proposes a geometric framework that takes projective Hilbert space as the primary state space, with classical configuration and phase spaces arising as submanifolds of localized quantum states. It extends the construction to Brownian motion, lifted to stochastic unitary evolution in projective Hilbert space. Applications discussed include measurement, classical emergence, the double-slit experiment, composite systems, and entangled states. The range and universality of this mechanism for realistic many-body measuring environments is stated as an open problem.
In briefDetection times are not local observables in quantum field theory
SummaryThe paper shows that, under natural covariance and consistency requirements, observables describing detection times cannot be algebraically localized in any bounded spacetime region, even when the records themselves are localized. This challenges equating algebraic localization with the physical localization of measurements. The authors further argue that microcausality alone does not establish non-signalling for measurements in quantum field theory.
WhyThe authors argue that detection-time observables cannot be algebraically localized in bounded regions, challenging the usual identification with physical localization of measurements.
In briefHow interaction order sets the cost of sustaining quantum magic under noise
SummaryThis paper studies the minimum resource cost of keeping a positive steady-state quantum magic in autonomous qubit networks subject to depolarization noise. It gives an optimal onset scaling of γ(γ/J)^{1/(k-1)} for local stabilizer replacement resets, with a leading coefficient of 1/(2√2) for two-body interactions. The converse bound uses hafnian stabilizer geometry together with a positive random-order forest expansion.
In briefClassical and quantum logics that each have several mutually non-equivalent, non-isomorphic models
SummaryThe paper concerns the finding that both quantum and classical logics have several models that are neither equivalent nor isomorphic to one another, a result that has been proved repeatedly in the literature. Some authors have recently criticized this result. The authors argue that these criticisms are either unfounded or wrong.
In briefA rule-based static analysis framework for quantum programs whose hardware constraints can be configured
SummaryThis paper presents SHARP, a rule-based static analysis framework for OpenQASM that separates hardware-specific constraints from the validation engine. It ingests instruction set architecture descriptions as standalone data, so the core engine need not change when hardware is updated. The framework also uses an analysis-driven mechanism for multi-stage validation to simplify rule construction and improve extensibility.
Yi-Ting Chen, Lauren Capelluto, Ryan Shaffer et al.
In brief"Seeing Why": Exact Evidence Maps for Quantum and Optical Image Classifiers
SummaryThe paper introduces Born evidence maps, which exactly split each class probability of quantum and all-optical image classifiers into contributions from the encoded image amplitudes. In simulation, four phase plates reach 72.3% accuracy on Caltech-10 colour photographs. On IBM's ibm_kingston hardware, 300 Caltech-10 test pictures were classified at 37.7% accuracy, against 10% by chance.
WhyThe authors give an exact evidence decomposition for linear quantum and optical classifiers, equal to Integrated Gradients, and report hardware validation on IBM's ibm_kingston.
In briefQuantum Path Finder: a new quantum algorithm design based on gauge dynamics in constraint space
SummaryThis paper introduces Quantum Path Finder (QPF), a quantum algorithm design paradigm that uses non-Abelian gauge dynamics within a constraint-protected degenerate manifold, with each Boolean variable encoded as a qutrit that includes an unassigned state. The authors illustrate the framework on unstructured search, complete 3-XORSAT, and satisfiable 3-SAT instances. They also outline a superconducting-qutrit implementation and discuss its conceptual relation to nondeterministic Turing machines.
