Quantum

Paper

Quantum Galilei group as quantum reference frame transformations

Angel Ballesteros, Diego Fernandez-Silvestre, Flaminia Giacomini, and Giulia Gubitosi,

Quantum 9, 1935 (2025).

Quantum groups have been widely explored as a tool to encode possible nontrivial generalisations of reference frame transformations, relevant in quantum gravity. In quantum information, it w…

Paper

Generalized Conditional Displacement

Shiran Even-Haim, Asaf A. Diringer, Ron Ruimy, Gefen Baranes, Alexey Gorlach, Shay Hacohen-Gourgy, and Ido Kaminer,

Quantum 9, 1934 (2025).

Conditional displacement with a qubit ancilla is a critical component in continuous-variable error correction protocols. We present the generalized conditional displacement operator, conditi…

Paper

Multiple quantum exceptional, diabolical, and hybrid points in multimode bosonic systems: II. Nonconventional PT-symmetric dynamics and unidirectional coupling

Jan Perina Jr, Kishore Thapliyal, Grzegorz Chimczak, Anna Kowalewska-Kudlaszyk, and Adam Miranowicz,

Quantum 9, 1933 (2025).

We analyze the existence and degeneracies of quantum exceptional, diabolical, and hybrid points in simple bosonic systems – comprising up to six modes with damping and/or amplification – und…

Paper

Multiple quantum exceptional, diabolical, and hybrid points in multimode bosonic systems: I. Inherited and genuine singularities

Kishore Thapliyal, Jan Perina Jr., Grzegorz Chimczak, Anna Kowalewska-Kudlaszyk, and Adam Miranowicz,

Quantum 9, 1932 (2025).

The existence and degeneracies of quantum exceptional, diabolical, and hybrid (i.e., diabolically degenerated exceptional) singularities of simple bosonic systems composed of up to five mode…

Paper

QUITS: A modular Qldpc code circUIT Simulator

Mingyu Kang, Yingjia Lin, Hanwen Yao, Mert Gökduman, Arianna Meinking, and Kenneth R. Brown,

Quantum 9, 1931 (2025).

To achieve quantum fault tolerance with lower overhead, quantum low-density parity-check (QLDPC) codes have emerged as a promising alternative to topological codes such as the surface code,…

Paper

Expanding bipartite Bell inequalities for maximum multi-partite randomness

Lewis Wooltorton, Peter Brown, and Roger Colbeck,

Quantum 9, 1930 (2025).

Nonlocal tests on multi-partite quantum correlations form the basis of protocols that certify randomness in a device-independent (DI) way. Such correlations admit a rich structure, making th…

Paper

Stochastic approximate state conversion for entanglement and general quantum resource theories

Tulja Varun Kondra, Chandan Datta, and Alexander Streltsov,

Quantum 9, 1929 (2025).

Quantum resource theories provide a mathematically rigorous way of understanding the nature of various quantum resources. An important problem in any quantum resource theory is to determine…

Paper

Optically Hyperpolarized Materials for Levitated Optomechanics

Marit O. E. Steiner, Julen S. Pedernales, and Martin B. Plenio,

Quantum 9, 1928 (2025).

We explore the potential of levitating solids embedded with non-permanent, optically controllable electron spins, which can be used to hyperpolarize their nuclear spin environment with excep…

Paper

Programming tools for Analogue Quantum Computing in the High-Performance Computing Context – A Review

Mateusz Meller, Vendel Szeremi, and Oliver Thomson Brown,

Quantum 9, 1927 (2025).

Recent advances in quantum computing have brought us closer to realizing the potential of this transformative technology. While significant strides have been made in quantum error correction…

Paper

Polynomial-Time Classical Simulation of Hidden Shift Circuits via Confluent Rewriting of Symbolic Sums

Matthew Amy and Lucas Shigeru Stinchcombe,

Quantum 9, 1926 (2025).

Implementations of Roetteler's shifted bent function algorithm have in recent years been used to test and benchmark both classical simulation algorithms and quantum hardware. These circuits…

Paper

All You Need is pi: Quantum Computing with Hermitian Gates

Ben Zindorf and Sougato Bose,

Quantum 9, 1925 (2025).

Universal gate sets for quantum computation, when single and two qubit operations are accessible, include both Hermitian and non-Hermitian gates. Here we utilize the fact that any single-qub…

Paper

Quantum Chaos and Universal Trotterisation Behaviours in Digital Quantum Simulations

Cahit Kargi, Angsar Manatuly, Lukas M. Sieberer, Juan Pablo Dehollain, Fabio Henriques, Tobias Olsacher, Philipp Hauke, Markus Heyl, Peter Zoller, and Nathan K. Langford,

Quantum 9, 1924 (2025).

Digital quantum simulation (DQS) is one of the most promising paths for achieving first useful real-world applications for quantum processors. Yet even assuming rapid progress in device engi…

Paper

Consistent circuits for indefinite causal order

Augustin Vanrietvelde, Nick Ormrod, Hlér Kristjánsson, and Jonathan Barrett,

Quantum 9, 1923 (2025).

Over the past decade, a number of quantum processes have been proposed which are logically consistent, yet feature a cyclic causal structure. However, there is no general formal method to co…

Paper

QRAM: A Survey and Critique

Samuel Jaques and Arthur G. Rattew,

Quantum 9, 1922 (2025).

Quantum random-access memory (QRAM) is a mechanism to access data (quantum or classical) based on addresses which are themselves a quantum state. QRAM has a long and controversial history, a…

Paper

Solving one-body ensemble N-representability problems with spin

Julia Liebert, Federico Castillo, Jean-Philippe Labbé, Tomasz Maciazek, and Christian Schilling,

Quantum 9, 1921 (2025).

The Pauli exclusion principle is fundamental to understanding electronic quantum systems. It namely constrains the expected occupancies $n_i$ of orbitals $\varphi_i$ according to…

Paper

Quantum error correction for long chains of trapped ions

Min Ye and Nicolas Delfosse,

Quantum 9, 1920 (2025).

We propose a model for quantum computing with long chains of trapped ions and we design quantum error correction schemes for this model. The main components of a quantum error correction sch…

Category: Paper