Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Noise Protected Logical Qubit in a Open Chain of Superconducting Qubits with Ultrastrong Interactions
Roberto Stassi, Shilan Abo, Daniele Lamberto +4 more·Sep 22, 2025
To achieve a fault-tolerant quantum computer, it is crucial to increase the coherence time of quantum bits. In this work, we theoretically investigate a system consisting of a series of superconducting qubits that alternate between XX and YY ultrastr...
Bosonic content of three-fermion high-spin states
Jerzy Cioslowski, Krzysztof Strasburger, Denis K. Sunko·Sep 22, 2025
A rigorous characterization of the information content of any high-spin threefermion wave function is presented. It is based upon a formal decomposition of the wave function into a finite set of fixed invariants, called shapes, whose sole purpose is ...
Comparison of trapped-ion entangling gate mechanisms for mixed species
V. M. Schäfer, A. C. Hughes, O. Bazavan +4 more·Sep 22, 2025
Entangling gates are an essential capability of quantum computers. There are different methods for implementing two-qubit gates, with respective advantages and disadvantages. We investigate the experimentally relevant differences and commonalities of...
Quantum Portfolio Optimization: An Extensive Benchmark
Eric Stopfer, Friedrich Wagner·Sep 22, 2025
Recently, several researchers proposed portfolio optimization as a potential use case for quantum optimization. However, the literature is lacking an extensive benchmark quantifying the potential of quantum computers for portfolio optimization. In th...
Fast qubit-based frequency recovery algorithm for quantum key distribution
Feng-Yu Lu, Zheng-Kai Huang, Jia-Jv Deng +7 more·Sep 22, 2025
Clock synchronization serves as a foundational subsystem in quantum key distribution (QKD). The recently proposed Qubit-based synchronization (Qubit4Sync) has opportunities in eliminating additional cost, noise, and potential side channels. It offers...
Fast and Accurate Decoder for the XZZX Code Using Simulated Annealing
Tatsuya Sakashita·Sep 22, 2025
The XZZX code is a variant of the surface code tailored to address biased noise in realistic quantum devices. We propose a simulated annealing (SA) decoder for the XZZX code. Our SA decoder is amenable to parallelization because its MCMC updates are ...
Strong Disorder Renormalization Group Method for Bond Disordered Antiferromagnetic Quantum Spin Chains with Long Range Interactions: Excited States and Finite Temperature Properties
Stefan Kettemann·Sep 22, 2025
We extend the recently introduced strong disorder renormalization group method in real space, well suited to study bond disordered antiferromagnetic power law coupled quantum spin chains, to study excited states, and finite temperature properties. Fi...
Exact gradient for general cost functions in variational quantum algorithms
Jesus Urbaneja, Le Bin Ho·Sep 22, 2025
We present a unitary-based gradient formulation for variational quantum algorithms (VQAs) that applies to general differentiable cost function defined by a parameterized quantum circuit composed of Pauli-generated rotations. The gradient is obtained ...
Functional Information in Quantum Darwinism: An Operational Measure of Objectivity
Arda Batin Tank·Sep 22, 2025
Quantum Darwinism explains the emergence of classical objectivity through the redundant encoding of pointer information in environmental fragments. However, existing diagnostics rely on arbitrary thresholds or structural assumptions that limit their ...
Hybrid Trapping of Cold Atoms with Surface Forces and Blue-Detuned Evanescent Light on a Nanophotonic Waveguide
Riccardo Pennetta, Antoine Glicenstein, Philipp Schneeweiss +2 more·Sep 22, 2025
We demonstrate a novel hybrid nanophotonic trap for cold neutral atoms, leveraging surface forces for attraction and blue-detuned evanescent light for repulsion. We attribute the attractive potential to a combination of Casimir-Polder interactions an...
Quantum Public Key Encryption for NISQ Devices
Nishant Rodrigues, Walter O. Krawec, Brad Lackey +2 more·Sep 22, 2025
Quantum public-key encryption (PKE), where public-keys and/or ciphertexts can be quantum states, is an important primitive in quantum cryptography. Unlike classical PKE (e.g., RSA or ECC), quantum PKE can leverage quantum-secure cryptographic assumpt...
Digital controllability of transverse field Ising chains
Vincenzo Roberto Arezzo, Ruiyi Wang, Kiran Thengil +2 more·Sep 22, 2025
Quantum Annealing (QA) encounters limitations when the energy gap along the annealing path becomes exponentially small, leading to impractically long runtimes. In contrast, the success of hybrid digital methods like the Quantum Approximate Optimizati...
Single-shot pulse retrieval of femtosecond bright squeezed vacuum
Yuval Kern, Ido Nisim, Michael Birk +7 more·Sep 22, 2025
Bright squeezed vacuum (BSV) is an intense quantum state of light with zero mean electric field and huge photon number fluctuations, sufficiently intense to drive extreme nonlinear processes and imprint nonclassical statistics. However, the temporal ...
Accelerated characterization of two-level systems in superconducting qubits via machine learning
Avinash Pathapati, Olli Mansikkamäki, Alexander Tyner +1 more·Sep 22, 2025
We introduce a data-driven approach for extracting two-level system (TLS) parameters-frequency $ω_{TLS}$, coupling strength $g$, dissipation time $T_{TLS, 1}$, and the pure dephasing time $T^φ_{TLS, 2}$, labelled as a 4-component vector $\vec{q}$, di...
Enhanced fill probability estimates in institutional algorithmic bond trading using statistical learning algorithms with quantum computers
Axel Ciceri, Austin Cottrell, Joshua Freeland +13 more·Sep 22, 2025
The estimation of fill probabilities for trade orders represents a key ingredient in the optimization of algorithmic trading strategies. It is bound by the complex dynamics of financial markets with inherent uncertainties, and the limitations of mode...
Transfer of entanglement from nonlocal photon to non-Gaussian CV states
Mikhail S. Podoshvedov, Sergey A. Podoshvedov·Sep 22, 2025
Continuous variable (CV) entanglement refers to the type of entanglement of quantum wave-like systems that are described by continuous variables in an inherently infinite-dimensional space. It can become a crucial resource for quantum communication, ...
Iterative construction of $\mathfrak{S}_p \times \mathfrak{S}_p$ group-adapted irreducible matrix units for the walled Brauer algebra
Michał Horodecki, Michał Studziński, Marek Mozrzymas·Sep 22, 2025
In this work, we present an algorithmic treatment of the representation theory of the algebra of partially transposed permutation operators, denoted by $\mathcal{A}^d_{p,p}$, which is a matrix representation of the abstract walled Brauer algebra. We ...
Entropy dynamics for a harmonic propeller-shaped planar molecular quantum Brownian rotator
J. Jeknic-Dugic, I. Petrovic, M. Arsenijevic +1 more·Sep 22, 2025
Dynamic stability is vital for the operation and control of molecular nanodevices, particularly molecular cogwheels in an external harmonic field. We used the relative change in rotator entropy as a measure of dynamical stability. This rotator dynami...
Demonstration of sequential processors with quantum advantage and analysis of classical performance limits
Shota Tateishi, Wenhao Wang, Baptiste Chevalier +3 more·Sep 22, 2025
In this paper, we theoretically and experimentally analyze sequential processors with limited communication between parts. We compare the expressivity of sequential quantum and classical processors under the same constraints. They consist of three or...
Certifying localizable quantum properties with constant sample complexity
Zhenyu Du, Jinchang Liu, Elias X. Huber +2 more·Sep 22, 2025
Characterizing increasingly complex quantum systems is a central task in quantum information science, yet experimental costs often scale prohibitively with system size. Certifying key properties -- such as entanglement, circuit complexity, and quantu...