Quantum

Paper

Strict hierarchy between $n$-wise measurement simulability, compatibility structures, and multi-copy compatibility

Lucas Tendick, Costantino Budroni, and Marco Túlio Quintino,

Quantum 10, 2231 (2026).

The incompatibility of quantum measurements, i.e. the fact that certain observable quantities cannot be measured jointly is widely regarded as a distinctive quantum feature with important im…

Paper

Composable logical gate error in approximate quantum error correction: reexamining gate implementations in Gottesman-Kitaev-Preskill codes

Lukas Brenner, Beatriz Dias, and Robert Koenig,

Quantum 10, 2230 (2026).

Quantifying the accuracy of logical gates is paramount in approximate error correction, where perfect implementations are often unachievable with the available set of physical operations. To…

Paper

Enhanced measurements on quantum computers via the simultaneous probing of non-commuting Pauli operators

Rick P. A. Simon, Zheng Shi, Charlie Nation, Andrew Jena, and Luca Dellantonio,

Quantum 10, 2229 (2026).

Measuring the state of quantum computers is a highly non-trivial task, with implications for virtually all quantum algorithms. A promising avenue is multi-copy schemes, where identical copie…

Paper

Quantum Graph Theory by Example

Gian Luca Spitzer and Ion Nechita,

Quantum 10, 2228 (2026).

Quantum graphs have been introduced by Duan, Severini, and Winter to describe the zero-error behaviour of quantum channels. Since then, quantum graph theory has become a field of study in it…

Paper

Limits to black-box amplification in QMA

Scott Aaronson, Phillip Harris, and Freek Witteveen,

Quantum 10, 2227 (2026).

We study the limitations of black-box amplification in the quantum complexity class ${\sf QMA}$. Amplification is known to boost any inverse-polynomial gap between completeness and soundness t…

Paper

Spinor Bose-Einstein condensate as an analog simulator of molecular bending vibrations

Ayaka Usui, Artur Niezgoda, and Manuel Gessner,

Quantum 10, 2226 (2026).

We demonstrate that spinor Bose-Einstein condensates (BECs) can be operated as an analog simulator of the two-dimensional vibron model. This algebraic model describes bending vibrations of m…

Paper

GPU-Accelerated Quantum Simulation of Stabilizer Circuits

Muhammad Osama, Dimitrios Thanos, and Alfons Laarman,

Quantum 10, 2225 (2026).

We introduce new parallel algorithms for efficiently simulating stabilizer (Clifford) circuits on GPUs, with a focus on data-parallel tableau evolution and scalable handling of projective me…

Paper

Fast Bosonic Control via Multiphoton Qubit-Oscillator Interactions

Noah Gorgichuk, Mohammad Ayyash, Matteo Mariantoni, and Sahel Ashhab,

Quantum 10, 2224 (2026).

We study the problem of $n$-fold rotationally symmetric bosonic state preparation, which is of great importance to bosonic quantum error correction, using a multiphoton interaction between an…

Paper

Universal Dilation of Linear Itô SDEs: Quantum Trajectories and Lindblad Simulation of Second Moments

Hsuan-Cheng Wu and Xiantao Li,

Quantum 10, 2223 (2026).

We present a universal framework for simulating $N$-dimensional linear Itô stochastic differential equations (SDEs) on quantum computers with additive or multiplicative noises. Building on a u…

Paper

Lifting the maximally-entangledness assumption in robust self-testing for synchronous games

Matthijs Vernooij and Yuming Zhao,

Quantum 10, 2222 (2026).

Robust self-testing in non-local games allows a classical referee to certify that two untrustworthy players are able to perform a specific quantum strategy up to high precision. Proving robu…

Paper

Time symmetry in quantum theories and beyond

John H. Selby, Maria E. Stasinou, Stefano Gogioso, and Bob Coecke,

Quantum 10, 2221 (2026).

There exists a stark tension among different formulations of quantum theory as some are inherently time-symmetric while others are time-asymmetric. This tension is crisply captured when cons…

Paper

Evidence for Exceptional Points as Topological Defects

Chia-Yi Ju and Szu-Ming Chen,

Quantum 10, 2220 (2026).

Studies have shown that quantum states reside in a Hilbert space bundle. When a quantum system depends on continuous external parameters, these parameters define additional dimensions in the…

Paper

Performance of the spin qubit shuttling architecture for a surface code implementation

Berat Yenilen, Arnau Sala, Hendrik Bluhm, Markus Müller, and Manuel Rispler,

Quantum 10, 2219 (2026).

Qubit shuttling promises to advance some quantum computing platforms to the qubit register sizes needed for effective quantum error correction (QEC), but also introduces additional errors wh…

Paper

Unitary causal decompositions: a characterisation via lattice theory

Tein van der Lugt and Robin Lorenz,

Quantum 10, 2218 (2026).

If a unitary transformation has a circuit representation with no directed path from input $a$ to output $b$, then $a$ does not influence $b$ through the overall unitary. Conversely, if a unitary sat…

Paper

Order Parameter Discovery for Quantum Many-Body Systems

Nicola Mariella, Tara Murphy, Francesco Di Marcantonio, Khadijeh Najafi, Sofia Vallecorsa, Sergiy Zhuk, and Enrique Rico,

Quantum 10, 2217 (2026).

Quantum phase transitions reveal deep insights into the behavior of many-body quantum systems, but identifying these transitions without prior knowledge of order parameters remains a signifi…

Paper

Truncation uncertainties for accurate quantum simulations of lattice gauge theories

Anthony N. Ciavarella, Siddharth Hariprakash, Jad C. Halimeh, and Christian W. Bauer,

Quantum 10, 2216 (2026).

The encoding of lattice gauge theories onto quantum computers requires a discretization of the gauge field's Hilbert space on each link, which presents errors with respect to the Kogut–Sussk…

Category: Paper