Quantum Computing research · Research Watch · Page 24

Preprint
Not peer reviewed
From Alice & Bob

A preprint proposes an entropy-based shortcut to estimate quantum error correction thresholds

Original title: Entropy threshold: A simple proxy for performance of quantum error correction

Researchers report a simple entropy-based proxy that estimates QEC thresholds without heavy simulations, matching numerical results fairly well.

Added 7 Oct 2026

Preprint
Not peer reviewed
From QuEra Computing

New method efficiently simulates fidelity of large non-Clifford quantum circuits

Original title: Efficient fidelity simulation of high-rate magic distillation circuits

A preprint presents classical algorithms to efficiently estimate fidelity of fault-tolerant circuits with many non-Clifford gates.

Added 7 Oct 2026

Preprint
Not peer reviewed

Researchers report quantum algorithm shortcut for simulating multi-exciton states in materials

Original title: Quasiparticle quantum simulation of materials with the Bethe-Salpeter equation

A preprint reports a quasiparticle-based quantum algorithm that could sharply cut the computing cost of simulating multi-exciton states in semiconductors.

Jielun Chen et al. · Added 7 Oct 2026

Journal article
Peer reviewed

Study finds hollow-core fibre could reshape quantum repeater network design

Original title: Quantum networking with advances in fiber technology

A peer-reviewed study reports that hollow-core fibre can substantially outperform standard silica fibre in simulated quantum repeater networks.

Prateek Mantri et al. · Added 6 Oct 2026

Preprint
Not peer reviewed
From Google

Preprint proposes modular hyperbolic codes to cut quantum error correction overhead

Original title: Low-Overhead Quantum Error Correction with Boundary-Connected Planar Modules

A preprint reports that boundary-linked planar modules built from hyperbolic surface and colour codes could sharply cut the qubit overhead needed for quantum error correction.

Added 6 Oct 2026

Preprint
Not peer reviewed
From IonQ

Preprint: trapped-ion quantum computer recovers magnet’s spin spectra with compressed circuits

Original title: Quantum simulation of field-tunable spin spectroscopy of the quantum magnet Cs2CoCl4 on a trapped-ion quantum computer

Researchers report simulating a 36-site quantum magnet model on IonQ hardware, matching classical and neutron-scattering benchmarks using compact circuits.

Added 6 Oct 2026

Preprint
Not peer reviewed

Researchers report quantum-dot photon source supports entanglement-swapped key distribution

Original title: Quantum Key Distribution with Entanglement-Swapped Photons from a Quantum Emitter

A preprint reports secure key exchange using entanglement-swapped photons from a quantum dot source, a step towards quantum repeaters.

Michele B. Rota et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

A preprint proposes judging noisy quantum computers by recoverable information, not perfect states

Original title: Recoverable Quantum Computation: An Information-Centric Paradigm for Quantum Computing with Errors

A single-author preprint outlines a framework for deciding when noisy quantum computers can still give useful answers, without needing full error correction.

Shengwang Du · Added 6 Oct 2026

Preprint
Not peer reviewed

Preprint describes a self-correcting quantum computer built from local, translation-invariant dynamics

Original title: Quantum Memory and Autonomous Computation in Two Dimensions

A preprint outlines a two-dimensional dissipative scheme that autonomously corrects errors and runs fault-tolerant quantum computation without measurements.

Gesa Dünnweber et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

Preprint explores hybrid error correction for linking quantum processors over photonic links

Original title: Loss-tolerant distributed lattice surgery using fusion networks

A preprint examines hybrid measurement- and circuit-based schemes for connecting quantum processors via lossy photonic links.

Felix Burt et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

Researchers report adaptive single-copy measurements can match two-copy stabilizer learning

Original title: Adaptivity is all you need: Optimal stabilizer learning using just single-copy measurements

A preprint reports that adaptive single-copy measurements learn stabilizer states as efficiently as two-copy Bell sampling.

L. Bittel et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

Preprint reports quantum memory edge for a polynomial-fitting problem in streaming setting

Original title: Exponential quantum advantages for decoded quantum interferometry in the streaming setting

A preprint reports that an adapted quantum algorithm beats classical streaming methods on a polynomial-fitting problem using far less memory.

Kewen Wu et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

Experiment tests Grover’s algorithm for detecting unknown-frequency signals

Original title: Experimental quantum-computing-enhanced sensing using Grover's algorithm

Researchers built a small superconducting qubit-cavity device to test whether Grover's algorithm can improve signal detection over wide bandwidths.

Mathieu Ouellet et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

Preprint reports constant-overhead method for fault-tolerant quantum state preparation

Original title: Fault-tolerant interfaces for quantum LDPC codes

A preprint reports a fault-tolerant scheme for preparing quantum states that needs only constant, rather than growing, qubit overhead.

Matthias Christandl et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

Preprint reports long-lived defects that leave a lasting imprint on qubit noise

Original title: Quantum environment afterglow from broadband excitation spectroscopy in superconducting qubits

Researchers report broadband excitation spectroscopy reveals long-lived two-level-system defects that make superconducting qubit noise non-Markovian and history-dependent.

J. R. Guimarães et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

Preprint reports stabilizer states that stabilizer operations cannot tell apart

Original title: Testing nonstabilizerness only with stabilizer states

A preprint describes stabilizer-state sets that stabilizer operations cannot perfectly distinguish, enabling a new test for nonstabilizerness without resourceful states.

Hyukjoon Kwon · Added 6 Oct 2026

Preprint
Not peer reviewed

Researchers propose a way to purify noisy quantum oracles and preserve search speedups

Original title: Oracle Distillation

A preprint describes oracle distillation, a protocol that turns many noisy quantum oracle queries into one high-fidelity query, preserving some quantum advantages under noise.

Ruohan Shen et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

A preprint proposes a unified error-correction scheme for identical-particle qubits

Original title: A Unified Error Correction Code for Universal Quantum Computing with Identical Particles

A preprint argues that qubits built from identical particles need reworked error-correction strategies because their noise interaction behaves differently from standard qubits.

S. L. Wu et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

A preprint reports log-depth circuits for preparing Hamming-weight-preserving quantum states

Original title: Preparation of Hamming-Weight-Preserving Quantum States with Log-Depth Quantum Circuits

A preprint presents quantum circuits that prepare fixed-excitation quantum states with depth scaling logarithmically rather than linearly.

Yu Li et al. · Added 6 Oct 2026

Preprint
Not peer reviewed

Preprint proposes symbolic Pauli propagation to pre-train quantum circuits off-chip

Original title: Symbolic Pauli Propagation for Gradient-Enabled Pre-Training of Quantum Circuits

A preprint describes a symbolic method to approximate quantum circuit observables, enabling classical pre-training before running on quantum hardware.

Saverio Monaco et al. · Added 6 Oct 2026

523 entries