1155 papers
This paper bridges the gap between theory and implementation for the quantum simulation of coupled harmonic oscillators by developing and benchmarking three distinct algorithmic realizations on the Classiq platform, demonstrating that complex initial state preparation can be circumvented while providing concrete resource estimates and physical applications for achieving practical quantum advantage.
This paper introduces a generalized left-right framework for designing high-performance syndrome extraction circuits for arbitrary CSS codes, which optimizes circuit depth and error resilience to achieve up to an order-of-magnitude improvement in logical performance over existing designs.
This paper proposes an enhanced iterative belief propagation decoder for quantum Tanner codes that groups check nodes into generalized checks decoded via maximum a posteriori methods, demonstrating significant performance gains over existing decoders in finite-length settings while identifying limited benefits for other qLDPC code families through both empirical results and theoretical cycle analysis.
This paper introduces the first sample-efficient, ancilla-free protocol for learning sparse Lindbladian generators of open quantum systems without requiring prior assumptions about interaction structure or locality, utilizing only product-state preparations and Pauli measurements to enable scalable characterization of unknown error mechanisms.
This paper introduces "mirror codes," a versatile family of non-CSS quantum LDPC codes constructed from group parameters that, when paired with provably fault-tolerant syndrome extraction circuits, achieve competitive error thresholds around 0.2% for near-term fault-tolerant quantum memory applications.
This paper presents an efficient numerical method based on a generalized Lanczos algorithm that utilizes moment information to compute trace distances between pure and mixed Gaussian states in continuous-variable systems, while also providing lower bounds for mixed-mixed comparisons and extending to certain non-Gaussian states.
This paper introduces group surface codes as a generalization of the surface code that enables universal quantum computation by implementing non-Clifford gates and transversal classical operations, thereby bypassing the computational limitations of topological Pauli stabilizer models imposed by the Bravyi-König theorem.
This paper identifies and characterizes two previously elusive families of core-bound excitations (varicose and fluting waves) on Gross-Pitaevskii vortices, detailing their dispersion relations across different wavelength limits and proposing a spectroscopic protocol for their experimental detection.
This paper proposes a novel quantum-based privacy-preserving camera system that stores low-resolution imagery in reversible quantum states and utilizes a double deep Q-learning algorithm to dynamically balance privacy and utility before measurement, demonstrating the feasibility of controlling both aspects in simulation.
This paper proposes a universal, device-independent self-testing scheme based on a simple star quantum network that can certify arbitrary quantum states (including mixed ones) and measurements (including non-extremal and composite ones) up to complex conjugation.
This paper investigates the relationship between non-local magic and entanglement in quantum many-body systems, establishing bounds on classical simulation hardness and conjecturing a linear scaling in conformal field theories, while proving that in holographic duals, non-local magic vanishes precisely when gravitational back-reaction is absent and is approximately equal to the rate of change of minimal surface area with respect to cosmic brane tension.
This paper introduces the concept of agnostic tomography and presents an efficient algorithm that learns a stabilizer product state approximating an arbitrary quantum state as well as the best possible match within that class, running in polynomial time for constant fidelity.
This paper provides an analytical study of the dynamical Lie algebras underlying the Quantum Approximate Optimization Algorithm (QAOA) for general, cycle, and complete graphs, deriving explicit bases and dimension bounds to prove the absence of barren plateaus for cycle graphs and characterizing the algebraic structure for complete graphs.
This paper establishes new, improved, single-letter upper bounds on the error exponents for quantum state and channel exclusion tasks by introducing a multivariate barycentric Chernoff divergence, which also yields the first efficiently computable bound for symmetric binary channel discrimination and solves the exact error exponent for classical channel exclusion.
This paper demonstrates that near-optimal discrimination of coherent states, surpassing the traditional Gaussian limit and approaching the Helstrom bound, can be achieved using continuously labelled non-Gaussian measurements via non-Gaussian unitary operations with homodyne detection or orthogonal polynomials, thereby eliminating the necessity for discrete photon detection.
This paper extends Nielsen's Theorem on LOCC ordering to bipartite quantum systems described by commuting von Neumann algebras, establishing a one-to-one correspondence between the classification of factors (types I, II, and III) and their operational entanglement properties, such as infinite single-shot entanglement and the ability to transition between arbitrary pure states with arbitrary precision.
This paper demonstrates that high-harmonic generation in semiconductors produces a non-classical, multimode displaced squeezed state with an almost single-mode structure, confirmed by correlation measurements and Cauchy-Schwarz inequality violations, establishing it as a viable room-temperature resource for quantum technologies.
This paper introduces a compositional "approximate sample and query" access model for quantum encoded data, demonstrating its utility in achieving polynomial improvements for distributed inner product estimation and partially characterizing the capabilities of time-limited fault-tolerant quantum circuits.
This paper establishes a generalized -pairing framework for interacting non-Hermitian Hubbard models in arbitrary dimensions, revealing novel phenomena such as asymmetric eigenoperators, spatially modulated states, and anomalous skin effects that unify and extend traditional symmetry concepts beyond Hermitian limits.
This paper demonstrates that the proposed quantum-optical multimode mixer model for gravitational redshift is only valid to first order under specific conditions and offers a partial solution requiring a transformation matrix with auxiliary modes at least equal in number to the photonic state modes.