Quantum

Paper

The discrete adiabatic quantum linear system solver has lower constant factors than the randomized adiabatic solver

Pedro C.S. Costa, Dong An, Ryan Babbush, and Dominic Berry,

Quantum 9, 1887 (2025).

The solution of linear systems of equations is the basis of many other quantum algorithms, and recent results provided an algorithm with optimal scaling in both the condition number $\kappa$ a…

Paper

Error Correction in Dynamical Codes

Esther Xiaozhen Fu and Daniel Gottesman,

Quantum 9, 1886 (2025).

We ask what is the general framework for a quantum error correcting code that is defined by a sequence of measurements. Recently, there has been much interest in Floquet codes and space-time…

Paper

Conditional disclosure of secrets with quantum resources

Vahid R. Asadi, Kohdai Kuroiwa, Debbie Leung, Alex May, Sabrina Pasterski, and Chris Waddell,

Quantum 9, 1885 (2025).

The conditional disclosure of secrets (CDS) primitive is among the simplest cryptographic settings in which to study the relationship between communication, randomness, and security. CDS inv…

Paper

Quantum Error Correction resilient against Atom Loss

Hugo Perrin, Sven Jandura, and Guido Pupillo,

Quantum 9, 1884 (2025).

We investigate quantum error correction protocols for neutral atoms quantum processors in the presence of atom loss. We complement the surface code with loss detection units (LDU) and analyz…

Paper

On the average-case complexity of learning output distributions of quantum circuits

Alexander Nietner, Marios Ioannou, Ryan Sweke, Richard Kueng, Jens Eisert, Marcel Hinsche, and Jonas Haferkamp,

Quantum 9, 1883 (2025).

In this work, we show that learning the output distributions of brickwork random quantum circuits is average-case hard in the statistical query model. This learning model is widely used as a…

Paper

Deep-Circuit QAOA

Gereon Koßmann, Lennart Binkowski, Lauritz van Luijk, Timo Ziegler, and René Schwonnek,

Quantum 9, 1882 (2025).

Paper

Classical simulation and quantum resource theory of non-Gaussian optics

Oliver Hahn, Ryuji Takagi, Giulia Ferrini, and Hayata Yamasaki,

Quantum 9, 1881 (2025).

We propose efficient algorithms for classically simulating Gaussian unitaries and measurements applied to non-Gaussian initial states. The constructions are based on decomposing the non-Gaus…

Paper

Shadows and subsystems of generalized probabilistic theories: when tomographic incompleteness is not a loophole for contextuality proofs

David Schmid, John H. Selby, Vinicius P. Rossi, Roberto D. Baldijão, and Ana Belén Sainz,

Quantum 9, 1880 (2025).

It is commonly believed that failures of tomographic completeness undermine assessments of nonclassicality in noncontextuality experiments. In this work, we study how such failures can indee…

Paper

Single-shot preparation of hypergraph product codes via dimension jump

Yifan Hong,

Quantum 9, 1879 (2025).

Quantum error correction is a fundamental primitive of fault-tolerant quantum computing. But in order for error correction to proceed, one must first prepare the codespace of the underlying…

Paper

Certifying quantum enhancements in thermal machines beyond the Thermodynamic Uncertainty Relation

José A. Almanza-Marrero and Gonzalo Manzano,

Quantum 9, 1878 (2025).

Quantum coherence has been shown to impact the operational capabilities of quantum systems performing thermodynamic tasks in a significant way, and yet the possibility and conditions for gen…

Paper

Quantum channel coding: Approximation algorithms and strong converse exponents

Aadil Oufkir and Mario Berta,

Quantum 9, 1877 (2025).

We study relaxations of entanglement-assisted quantum channel coding and establish that non-signaling assistance and a natural semi-definite programming relaxation — termed meta-converse — a…

Paper

Quantum Lego and XP Stabilizer Codes

Ruohan Shen, Yixu Wang, and ChunJun Cao,

Quantum 9, 1876 (2025).

We apply the recent graphical framework of "Quantum Lego" to XP stabilizer codes where the stabilizer group is generally non-Abelian. We show that the idea of operator matching continues to…

Paper

Knot invariants and indefinite causal order

Samuel Fedida, Anne-Catherine de la Hamette, Viktoria Kabel, and Časlav Brukner,

Quantum 9, 1875 (2025).

We explore indefinite causal order between events in the context of quasiclassical spacetimes in superposition. We introduce several new quantifiers to measure the degree of indefiniteness o…

Paper

Monitored quantum transport: full counting statistics of a quantum Hall interferometer

C.W.J. Beenakker and Jin-Fu Chen,

Quantum 9, 1874 (2025).

We generalize the Levitov-Lesovik formula for the probability distribution function of the electron charge transferred through a phase coherent conductor, to include projective measurements…

Paper

Backpropagation scaling in parameterised quantum circuits

Joseph Bowles, David Wierichs, and Chae-Yeun Park,

Quantum 9, 1873 (2025).

The discovery of the backpropagation algorithm ranks among one of the most important moments in the history of machine learning, and has made possible the training of large-scale neural netw…

Paper

Meson dynamics from locally exciting a particle-conserving $Z_2$ lattice gauge theory

Vaibhav Sharma and Kaden R. A. Hazzard,

Quantum 9, 1872 (2025).

Quantum simulation of lattice gauge theories is an important avenue to gain insights into both particle physics phenomena and constrained quantum many-body dynamics. There is a growing inter…

Category: Paper