Quantum – the open journal for quantum science

Quantum has published 631 Papers in 6 Volumes, as well as 63 Views in Quantum Views.

Call for editors 2022

This year Quantum will celebrate 5 years since the first publications! From that first batch of papers, the journal grew to over 600 published articles. This growth was made possible by …

Paper

Relaxation times do not capture logical qubit dynamics

Amit Kumar Pal, Philipp Schindler, Alexander Erhard, Ángel Rivas, Miguel-Angel Martin-Delgado, Rainer Blatt, Thomas Monz, and Markus Müller,

Quantum 6, 632 (2022).

Quantum error correction procedures have the potential to enable faithful operation of large-scale quantum computers. They protect information from environmental decoherence by storing it in…

Paper

Computational power of one- and two-dimensional dual-unitary quantum circuits

Ryotaro Suzuki, Kosuke Mitarai, and Keisuke Fujii,

Quantum 6, 631 (2022).

Quantum circuits that are classically simulatable tell us when quantum computation becomes less powerful than or equivalent to classical computation. Such classically simulatable circuits ar…

Paper

Pulse-level noisy quantum circuits with QuTiP

Boxi Li, Shahnawaz Ahmed, Sidhant Saraogi, Neill Lambert, Franco Nori, Alexander Pitchford, and Nathan Shammah,

Quantum 6, 630 (2022).

The study of the impact of noise on quantum circuits is especially relevant to guide the progress of Noisy Intermediate-Scale Quantum (NISQ) computing. In this paper, we address the pulse-le…

Paper

Pulser: An open-source package for the design of pulse sequences in programmable neutral-atom arrays

Henrique Silvério, Sebastián Grijalva, Constantin Dalyac, Lucas Leclerc, Peter J. Karalekas, Nathan Shammah, Mourad Beji, Louis-Paul Henry, and Loïc Henriet,

Quantum 6, 629 (2022).

Programmable arrays of hundreds of Rydberg atoms have recently enabled the exploration of remarkable phenomena in many-body quantum physics. In addition, the development of high-fidelity qua…

Paper

Robust quantum compilation and circuit optimisation via energy minimisation

Tyson Jones and Simon C. Benjamin,

Quantum 6, 628 (2022).

We explore a method for automatically recompiling a quantum circuit $\mathcal{A}$ into a target circuit $\mathcal{B}$, with the goal that both circuits have the same action on a specific input i…

Paper

Real time evolution with neural-network quantum states

Irene López Gutiérrez and Christian B. Mendl,

Quantum 6, 627 (2022).

A promising application of neural-network quantum states is to describe the time dynamics of many-body quantum systems. To realize this idea, we employ neural-network quantum states to appro…

Paper

Sequential optical response suppression for chemical mixture characterization

Alicia B. Magann, Gerard McCaul, Herschel A. Rabitz, and Denys I. Bondar,

Quantum 6, 626 (2022).

The characterization of mixtures of non-interacting, spectroscopically similar quantum components has important applications in chemistry, biology, and materials science. We introduce an app…

Paper

Faster quantum and classical SDP approximations for quadratic binary optimization

Fernando G.S L. Brandão, Richard Kueng, and Daniel Stilck França,

Quantum 6, 625 (2022).

We give a quantum speedup for solving the canonical semidefinite programming relaxation for binary quadratic optimization. This class of relaxations for combinatorial optimization has so far…

Paper

The quantum annealing gap and quench dynamics in the exact cover problem

Bernhard Irsigler and Tobias Grass,

Quantum 6, 624 (2022).

Quenching and annealing are extreme opposites in the time evolution of a quantum system: Annealing explores equilibrium phases of a Hamiltonian with slowly changing parameters and can be exp…

Paper

Temporal correlations in the simplest measurement sequences

Lucas B. Vieira and Costantino Budroni,

Quantum 6, 623 (2022).

We investigate temporal correlations in the simplest measurement scenario, i.e., that of a physical system on which the same measurement is performed at different times, producing a sequence…

Paper

Simulating Effective QED on Quantum Computers

Torin F. Stetina, Anthony Ciavarella, Xiaosong Li, and Nathan Wiebe,

Quantum 6, 622 (2022).

In recent years simulations of chemistry and condensed materials has emerged as one of the preeminent applications of quantum computing, offering an exponential speedup for the solution of t…

Paper

Experimental entanglement of temporal order

Giulia Rubino, Lee A. Rozema, Francesco Massa, Mateus Araújo, Magdalena Zych, Časlav Brukner, and Philip Walther,

Quantum 6, 621 (2022).

The study of causal relations has recently been applied to the quantum realm, leading to the discovery that not all physical processes have a definite causal structure. While indefinite caus…

Paper

Informationally restricted correlations: a general framework for classical and quantum systems

Armin Tavakoli, Emmanuel Zambrini Cruzeiro, Erik Woodhead, and Stefano Pironio,

Quantum 6, 620 (2022).

We introduce new methods and tools to study and characterise classical and quantum correlations emerging from prepare-and-measure experiments with informationally restricted communication. W…

Paper

Strongly nonlocal unextendible product bases do exist

Fei Shi, Mao-Sheng Li, Mengyao Hu, Lin Chen, Man-Hong Yung, Yan-Ling Wang, and Xiande Zhang,

Quantum 6, 619 (2022).

A set of multipartite orthogonal product states is locally irreducible, if it is not possible to eliminate one or more states from the set by orthogonality-preserving local measurements. An…

Paper

Fundamental thresholds of realistic quantum error correction circuits from classical spin models

Davide Vodola, Manuel Rispler, Seyong Kim, and Markus Müller,

Quantum 6, 618 (2022).

Mapping the decoding of quantum error correcting (QEC) codes to classical disordered statistical mechanics models allows one to determine critical error thresholds of QEC codes under phenome…