Quantum Computing research · Research Watch · Page 20

Preprint
Not peer reviewed

Researchers propose letting shuttled spin qubits leapfrog over occupied dots in silicon

Original title: Spin Qubit Leapfrogging: Dynamics of shuttling electrons on top of another

A preprint models a way for a mobile spin qubit to pass through an occupied quantum dot, exploiting low valley splitting to perform a two-qubit gate.

Nicklas Meineke et al. · Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint reports polynomial-time classical algorithms for simulating quantum impurity models

Original title: Polynomial-time classical and quantum simulation of quantum impurity models

A preprint reports that static properties of quantum impurity models can be computed classically in polynomial time, while dynamical properties stay quantum-hard.

Jiaqing Jiang et al. · Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint lecture notes outline quantum algorithms for solving differential equations

Original title: A Quantum Path to Partial Differential Equations

A preprint offers a tutorial linking numerical analysis and quantum computing through block-encoded PDE solvers.

Xiantao Li · Added 23 Oct 2026

Preprint
Not peer reviewed
From Foxconn

Preprint simplifies quantum weight reduction with near-optimal code parameters

Original title: Simplified Quantum Weight Reduction with Optimal Bounds

A preprint reports a streamlined geometric method for lowering quantum code check weights with near-optimal bounds.

Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint proposes fault-tolerant scheme for constant-excitation codes against coherent noise

Original title: Fault-Tolerant Quantum Error Correction for Constant-Excitation Stabilizer Codes under Coherent Noise

A preprint develops a fault-tolerant error correction framework for constant-excitation codes and reports better resilience to coherent noise than standard codes.

Ching-Yi Lai et al. · Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint proposes variance-based sampling to tighten qDRIFT error bounds

Original title: Optimized Randomized Hamiltonian Simulation via Average-Error Analysis

A preprint reports that sampling Hamiltonian terms by Hilbert-Schmidt norm can shrink average-case error bounds versus standard qDRIFT.

Hayata Morisaki et al. · Added 23 Oct 2026

Preprint
Not peer reviewed

A preprint develops an algebraic test for fault tolerance in quantum error-correcting circuits

Original title: Fault tolerance of quantum circuits with tensor networks and symplectic geometry

Researchers present an operator-algebraic and tensor-network method to certify fault tolerance of quantum circuits, tested on a Floquet code.

Soham Ghosh et al. · Added 23 Oct 2026

Preprint
Not peer reviewed
From Kipu Quantum

Preprint proposes hardware-native, measurement-free surface-code state preparation

Original title: Measurement-free Preparation of Surface-Code States with Digital-Analog Counterdiabatic Drivings

A preprint reports a digital-analog counterdiabatic method that prepares surface-code stabilizer states without measurement, using shallower circuits.

Added 23 Oct 2026

Preprint
Not peer reviewed

Preprint reports a fully local decoder enabling 2D fault-tolerant quantum computing

Original title: Local decoders for fault-tolerant quantum computation and translation-invariant stabilizer codes

A preprint describes a cellular-automaton decoder that lets a two-dimensional quantum computer correct errors using only local, constant-density classical resources.

Nathaniel Selub et al. · Added 22 Oct 2026

Journal article
Review status unknown
From Qubit Pharmaceuticals

Researchers report adaptive-grid quantum algorithm for real-space molecular chemistry

Original title: Real-Space Chemistry on Quantum Computers: A Fault-Tolerant Algorithm with Adaptive Grids and Transcorrelated Extension

A study proposes non-uniform grids and a transcorrelated Hamiltonian to make first-quantized quantum chemistry simulations more efficient.

Added 22 Oct 2026 · Released Jan 2026

Preprint
Not peer reviewed

Researchers report a sparse 6×6 quantum dot array using spin shuttling to cut crosstalk

Original title: Sparse qubit operation in a 6$\times$6 quantum dot array

A preprint describes a 6×6 quantum dot array where spin shuttling creates a sparse 10-qubit layout with far less crosstalk.

Alexader S. Ivlev et al. · Added 22 Oct 2026

Preprint
Not peer reviewed

Researchers drive trapped-ion qubit gates using an integrated chip-scale laser

Original title: Trapped Ion Qubit Gates and Entanglement Driven by an Integrated Photonic Laser

A preprint reports that a chip-based laser can perform coherent single- and two-qubit gates on a trapped ion, a step toward scalable quantum hardware.

Chris Caron et al. · Added 22 Oct 2026

Preprint
Not peer reviewed
From Alice & Bob

Preprint proposes continuous-variable flags to fix ancilla decay errors in bosonic codes

Original title: Protecting bosonic codes from ancilla-induced errors with continuous-variable flags

A preprint reports a flag-oscillator scheme that detects and corrects ancilla-decay errors in bosonic quantum memories.

Added 22 Oct 2026

Preprint
Not peer reviewed

Preprint links quantum circuit wiring choices to whether training can actually find solutions

Original title: When Expressivity Is Not Enough: Discrete Routing Geometry in Variational Quantum Circuits

A preprint argues that discrete CNOT routing shapes not just what a quantum circuit can represent, but whether gradient descent can reach good solutions at all.

Yu Wang · Added 22 Oct 2026

Preprint
Not peer reviewed
From Oratomic

Researchers report new qLDPC codes for high-rate, fast-decoded quantum processors

Original title: High-rate qLDPC processors

A preprint introduces mitten codes, qLDPC codes built from non-abelian groups that the authors say boost processor performance.

Added 22 Oct 2026

Preprint
Not peer reviewed

Researchers test a renormalisation-based circuit ansatz on a 30-qubit quantum processor

Original title: Emergent-Coupling-Based Ansatz Evaluated on a Superconducting Quantum Processor

A preprint reports that a renormalisation-group-inspired ansatz outperforms standard hardware-efficient circuits on disordered quantum chains.

Alina Joch et al. · Added 22 Oct 2026

Preprint
Not peer reviewed
From QC Ware

Preprint finds matching quantum training loss does not ensure useful sample generation

Original title: "Train classical, deploy quantum" requires rethinking generalization

A preprint reports that classically-optimised quantum generative models can match loss values yet generate very different shares of valid new samples.

Added 22 Oct 2026

Preprint
Not peer reviewed
From IBM Research

Researchers set criteria for when splitting quantum circuits across chips pays off

Original title: Structural Conditions for Distributed Quantum Advantage

A preprint proposes three structural tests for distributed quantum advantage and verifies bridging two toric-code patches on real hardware up to 142 spins.

Added 22 Oct 2026

Preprint
Not peer reviewed

Preprint examines when global search beats local search in quantum circuit optimisation

Original title: Optimization Geometry of QAOA and Variational Quantum Algorithms

A preprint studies how circuit design choices reshape the optimisation landscape of VQE and QAOA, and when global search outperforms local search.

Vojtěch Novák et al. · Added 22 Oct 2026

Preprint
Not peer reviewed

Researchers demonstrate beam-splitter coupling between Kerr-cat qubit and transmon

Original title: Experimental signatures of a $\hat{Z}\hat{X}$ beam-splitter interaction between Kerr-cat and transmon qubits

A preprint reports an experimental beam-splitter interaction linking a Kerr-cat qubit and a transmon, a step towards noise-biased error-correction ancillas.

Josiah Cochran et al. · Added 22 Oct 2026

523 entries