Quantum Computing research · Research Watch · Page 19

Preprint
Not peer reviewed

Researchers report simplified epitaxial NbN/AlN/NbN junctions for superconducting qubits

Original title: Sidewall spacer passivated epitaxial NbN/AlN/NbN Josephson junctions for superconducting qubit applications

A preprint describes a sidewall-spacer fabrication process for epitaxial NbN/AlN/NbN Josephson junctions that the authors say preserves electrical quality while cutting complexity.

Koki Honda et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Preprint describes gradient-based optimisation framework for superconducting qubit design

Original title: A General Framework for Gradient-Based Optimization of Superconducting Quantum Circuits using Qubit Discovery as a Case Study

A preprint presents an automatic-differentiation framework for optimising superconducting quantum circuits, applied to qubit discovery.

Taha Rajabzadeh et al. · Added 24 Oct 2026

Preprint
Not peer reviewed
From Google Quantum AI

Researchers report shallower circuits for block-encoding matrix polynomials on quantum hardware

Original title: Practical block encodings of matrix polynomials that can also be trivially controlled

A preprint describes circuit designs that make block-encoding matrix polynomials and controlling them far cheaper for near-term quantum devices.

Added 24 Oct 2026

Preprint
Not peer reviewed

Preprint describes nucleation method for preparing quantum states on digital computers

Original title: Digital quantum state preparation by nucleation

Researchers report a nucleation-inspired technique for preparing lattice-model ground states that can beat a leading state-of-the-art approach in 2D tests.

Jean Paul Sadia et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Preprint proposes hardware-aware aggregation for quantum federated learning on noisy devices

Original title: Q-RAIL: A Reliability-Aware Framework for Quantum Federated Learning on Heterogeneous Noisy Hardware

A preprint reports that weighting client updates by backend noise and circuit statistics improves quantum federated learning accuracy on simulated heterogeneous hardware.

Walid El Maouaki et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

A preprint reports an HDL-built Falcon accelerator fitting on one FPGA

Original title: Peregrino: A Full-Hardware Accelerator for the Complete Falcon Post-Quantum Digital Signature Scheme on Resource-Constrained Edge Devices

Researchers describe Peregrino, a hand-written hardware accelerator for the full Falcon post-quantum signature scheme on a single FPGA.

Antonio Carreño et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Preprint reports a coherent atom-molecule quantum interface using tweezer-trapped particles

Original title: A coherent quantum interface between a neutral atom and a polar molecule

Researchers report linking a single trapped atom and molecule for quantum readout, spin exchange and entanglement.

Daniel K. Ruttley et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Preprint reports ASIC design makes Mirath signatures faster and smaller than SLH-DSA

Original title: Efficient TCitH-Based Alternatives to SLH-DSA: Cross-Layer ASIC Design of Mirath

A preprint describes the first ASIC build of the Mirath post-quantum signature scheme, reporting large speed and area gains over SLH-DSA.

Hiandra Tomasi et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Preprint proposes quantum algorithm for nonlinear PDEs using homotopy analysis

Original title: Quantum Homotopy Algorithm for Solving Nonlinear PDEs and Flow Problems

Researchers outline a hybrid quantum method for solving nonlinear flow equations and test it with classical simulations of the homotopy approximation.

Sachin S. Bharadwaj et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

A preprint proposes an algorithm for allocating scarce quantum-safe links across networks

Original title: WLPA: A Network Management Framework for Allocating Scarce Quantum-Safe Link Postures under Weakest-Link Exposure

A preprint describes WLPA, a framework that allocates limited quantum-safe link upgrades by protecting a job's weakest link rather than ranking links individually.

Bhanwar Gupta et al. · Added 24 Oct 2026

Preprint
Not peer reviewed

Preprint reports faster algorithms to localise logical qubit information under photon loss

Original title: Logical information localisation in stabiliser codes via single-qubit measurements

A preprint proposes two algorithms that speed up finding where to read out logical information in stabiliser codes hit by qubit loss.

Jelena Mackeprang et al. · Added 23 Oct 2026

Preprint
Not peer reviewed
From Quantum Motion

Preprint evaluates layer codes as active quantum memories under circuit noise

Original title: Layer codes as quantum memories: syndrome extraction, thresholds and idle robustness

A preprint designs a syndrome extraction scheme for layer codes and finds they tolerate longer idle times than surface codes, but at higher qubit and gate cost.

Added 23 Oct 2026

Preprint
Not peer reviewed

Researchers report noisy 1D quantum circuits offer no parallel speed-up over classical ones

Original title: Parallel classical simulation of noisy shallow circuits: no quantum advantage in 1D

A preprint finds that noisy one-dimensional shallow quantum circuits can be matched by parallel classical algorithms, unlike higher-dimensional cases.

Robert Koenig et al. · Added 23 Oct 2026

Preprint
Not peer reviewed

A preprint reports an RL system that synthesises compact quantum state-preparation circuits

Original title: TATVA: A Reinforcement Learning Framework for Quantum Circuit Synthesis

A preprint describes TATVA, a dual-agent reinforcement learning system that builds high-fidelity quantum circuits up to five qubits.

Om Bhamare et al. · Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint proposes hierarchical processor to cut quantum error-correction overhead

Original title: Hierarchical Quantum Logical Processor with Amortized Long-Range Connectivity

A preprint describes a layered quantum code architecture that authors say needs far fewer qubits and faster error-correction cycles.

Zi-Han Chen et al. · Added 23 Oct 2026

Preprint
Not peer reviewed
From Zurich Instruments

Researchers report spiking neural networks for real-time qubit readout on FPGAs

Original title: Spiking neural networks for streaming qubit readout

A preprint reports spiking neural networks that classify superconducting qubit states as data arrives, nearly matching full-trace networks with FPGA-ready speed.

Added 23 Oct 2026

Preprint
Not peer reviewed
From IBM Research

Preprint explores quantum speedups beyond worst-case inputs

Original title: Quantum Query Complexity Beyond the Worst Case

A preprint applies smoothed analysis to quantum query complexity, reporting large speedups on perturbed string problems.

Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint reports modular neural decoder portable across quantum hardware and logic types

Original title: Modular Neural Decoder for Surface Code Memory and Logic on Superconducting Processors

A preprint describes a compact, reusable neural decoder that beats standard matching methods across memory, stability and lattice-surgery experiments on real quantum hardware.

Moritz Lange et al. · Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint proposes correlation-based shortcuts for learning large quantum systems

Original title: A Few Constrain Many: Correlation-Enhanced Learning of Many-Body Quantum Systems

A preprint reports that correlations between quantum observables can cut the measurements needed to estimate entanglement and magic in 100-qubit systems.

Matteo Tedde et al. · Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint proposes systematic search framework for single-ancilla fault-tolerant error correction

Original title: Bare-ancilla fault-tolerant syndrome extraction: General extensions of distance-three codes and structural criteria for graph codes

A preprint describes a general method for finding bare-ancilla fault-tolerant codes and reports extensions that enlarge valid code sets while keeping distance fixed.

Harsh Gupta et al. · Added 23 Oct 2026

523 entries