Quantum Computing research · Research Watch · Page 18

Preprint
Not peer reviewed
From Quantum Motion

Researchers report decoder confidence scores can cut logical error rates in quantum circuits

Original title: Error mitigation for logical circuits using decoder confidence

A preprint explores using decoder confidence scores to abort risky quantum circuit runs or statistically correct their output, reducing logical error impact.

Added 25 Oct 2026

Preprint
Not peer reviewed

Researchers propose two-qubit quantum memory using tunable detuning control

Original title: Quantum memory in an effective $Λ$-type system using dynamic detuning control of a superconducting qubit pair

A preprint proposes storing microwave photons in a pair of detuned superconducting qubits acting as an effective three-level memory.

Hsin Chang et al. · Added 25 Oct 2026

Preprint
Not peer reviewed

Researchers report quasilinear-cost method for classically verifying quantum computations

Original title: Classical Verification of Quantum Computation with Quasilinear Resources, from Compiled Nonlocal Games

A preprint describes a cryptographic protocol letting a classical verifier check a quantum computer's work with far less overhead than prior cubic-cost schemes.

Finn Holler et al. · Added 25 Oct 2026

Preprint
Not peer reviewed

Researchers report quantum memory decoders can miss hidden noise correlations

Original title: What Must a Quantum-Memory Decoder Know About Temporally Correlated Noise?

A preprint reports that syndrome data alone can leave quantum error-correction decoders unable to tell apart noise types needing different fixes.

Danesh Morales-Hashemi et al. · Added 25 Oct 2026

Preprint
Not peer reviewed
From IonQ

Researchers report a fix for quantum gate benchmarking when groups have multiplicity

Original title: Lifting Multiplicity in Randomized Benchmarking

A preprint describes a benchmarking method that avoids multi-exponential curve fitting for quantum gate groups with multiplicity.

Added 25 Oct 2026

Preprint
Not peer reviewed

Preprint reports non-Gaussian inputs can cut GKP magic state distillation costs

Original title: Improved GKP magic states from error-corrected non-Gaussian quantum states

A preprint reports that starting error correction from simple non-Gaussian states, rather than the vacuum, can shrink resources needed for GKP magic state distillation.

Sharon David et al. · Added 25 Oct 2026

Preprint
Not peer reviewed
From Phasecraft

Researchers report a faster probabilistic imaginary-time evolution algorithm for quantum chemistry

Original title: A quantum double-bracket algorithm for imaginary-time evolution with exponentially shorter depth

A preprint reports a probabilistic double-bracket algorithm that cuts circuit depth for quantum imaginary-time evolution.

Added 25 Oct 2026

Preprint
Not peer reviewed

Study maps where variational quantum circuits fail for a two-flavor lattice gauge model

Original title: Disentangling Expressibility, Symmetry Protection, and Hardware Noise in Variational Quantum Simulation of the Two-Flavor Schwinger Model

A preprint reports hardware noise, not circuit design, is what stops variational quantum simulation from scaling on a simple gauge theory.

Karthikeya Machiraju et al. · Added 25 Oct 2026

Preprint
Not peer reviewed

Researchers report silicon spin qubit reset without reservoirs or measurement

Original title: Reservoir- and Measurement-free Microwave Initialization of Semiconductor Spin Qubits

A preprint reports a microwave-only pulse sequence that initialises silicon spin qubits without reservoir access or readout feedback.

Leon C. Camenzind et al. · Added 25 Oct 2026

Preprint
Not peer reviewed
From AWS Center for Quantum Computing

Preprint models realistic noise, gates and read-out for superconducting GKP qubits

Original title: Modeling Logical Gates and Read-Out of Superconducting Gottesman-Kitaev-Preskill Qubits

A preprint presents theoretical tools linking realistic noise, logical gates and imperfect measurement for superconducting GKP qubits.

Added 25 Oct 2026

Preprint
Not peer reviewed

Preprint proposes error-mitigation scheme to cut quantum resource overheads

Original title: Compilation-informed probabilistic logical-error cancellation

A preprint describes a mitigation technique that aims to make high-precision quantum estimates independent of target precision in circuit size and code distance.

Giancarlo Camilo et al. · Added 25 Oct 2026

Preprint
Not peer reviewed

A preprint reports a compact quantum circuit learning exact algebraic rules

Original title: Universal Quantum Transformer

Researchers report that a small quantum attention circuit can learn modular arithmetic, group algebra and language rules with near-perfect precision.

Sungyong Chung et al. · Added 25 Oct 2026

Preprint
Not peer reviewed

Preprint explores quantum computer simulations of nuclear quantum effects in molecules

Original title: Molecular Dynamics with Nuclear Effects on Quantum Computers

A preprint reports a hybrid quantum-classical molecular dynamics method that includes nuclear quantum effects using a quantum computer.

Lukas Haßfurth et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Researchers report GNN-based post-selection for quantum error correction codes

Original title: Graph Neural Post-selection for Quantum Error Correction

A preprint reports graph neural networks that flag likely decoder failures from syndrome data alone, cutting logical error rates without extra decoder runs.

Conor Carty et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Researchers report running several quantum circuit compilations together to boost shot throughput

Original title: Compiling Together: High-Throughput Distributed Quantum Computing via Multi-Compilation

A preprint proposes running multiple equivalent circuit compilations together in distributed quantum computing to raise shot throughput and fidelity.

Yipei Liu et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Preprint reports exponential quantum space edge in randomly ordered data streams

Original title: Exponential quantum space advantage in random data streams

A preprint reports quantum algorithms can use exponentially less memory than classical ones on two streaming problems, even with randomly ordered data.

Adam Bouland et al. · Added 24 Oct 2026

Preprint
Not peer reviewed
From IBM Research

A preprint proposes variance-reduced gradient methods to cut quantum optimisation circuit costs

Original title: Breaking the Shot-Noise Barrier: Cached Recycled Variance-Reduced Gradients for Quantum Optimization

Researchers report a caching-based gradient technique for quantum optimisation that trims circuit use but often trails a simpler baseline.

Added 24 Oct 2026

Preprint
Not peer reviewed
From QudeLeap Research

Preprint describes optimal-query circuit for multivariate quantum polynomials

Original title: Multivariate quantum signal processing with optimal query complexity

A preprint presents a quantum circuit implementing multivariate trigonometric polynomials with query cost matching a proven lower bound.

Added 24 Oct 2026

Preprint
Not peer reviewed
From Xanadu

Preprint describes a denser QROM encoding that cuts quantum lookup costs further

Original title: Halving the cost of QROM again via dense encoding

A preprint reports a new QROM encoding that uses both Pauli bases of dirty qubits to cut quantum lookup costs beyond earlier methods.

Added 24 Oct 2026

Preprint
Not peer reviewed
From Tencent

Researchers report a unitary synthesis method optimal in both size and depth-ancilla tradeoff

Original title: Exact Unitary Synthesis: Simultaneously Optimal in Size and Depth-Ancilla Tradeoff

A preprint describes quantum circuits that reach optimal gate count while also hitting the best possible depth for any ancilla budget.

Added 24 Oct 2026

523 entries