Quantum

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…

Paper

QuantumCumulants.jl: A Julia framework for generalized mean-field equations in open quantum systems

David Plankensteiner, Christoph Hotter, and Helmut Ritsch,

Quantum 6, 617 (2022).

A full quantum mechanical treatment of open quantum systems via a Master equation is often limited by the size of the underlying Hilbert space. As an alternative, the dynamics can also be fo…

Paper

Dynamics of Open Quantum Systems II, Markovian Approximation

Marco Merkli,

Quantum 6, 616 (2022).

A finite-dimensional quantum system is coupled to a bath of oscillators in thermal equilibrium at temperature $T \gt 0$. We show that for fixed, small values of the coupling constant $\lambda$,…

Paper

Dynamics of Open Quantum Systems I, Oscillation and Decay

Marco Merkli,

Quantum 6, 615 (2022).

We develop a framework to analyze the dynamics of a finite-dimensional quantum system $\rm S$ in contact with a reservoir $\rm R$. The full, interacting $\rm SR$ dynamics is unitary. The reservoir…

Paper

Constant-sized correlations are sufficient to self-test maximally entangled states with unbounded dimension

Honghao Fu,

Quantum 6, 614 (2022).

Let $p$ be an odd prime and let $r$ be the smallest generator of the multiplicative group $\mathbb{Z}_p^\ast$. We show that there exists a correlation of size $\Theta(r^2)$ that self-tests a maximal…

Paper

Discrete-variable quantum key distribution with homodyne detection

Ignatius William Primaatmaja, Cassey Crystania Liang, Gong Zhang, Jing Yan Haw, Chao Wang, and Charles Ci-Wen Lim,

Quantum 6, 613 (2022).

Most quantum key distribution (QKD) protocols can be classified as either a discrete-variable (DV) protocol or continuous-variable (CV) protocol, based on how classical information is being…

Paper

Symmetry-protected sign problem and magic in quantum phases of matter

Tyler D. Ellison, Kohtaro Kato, Zi-Wen Liu, and Timothy H. Hsieh,

Quantum 5, 612 (2021).

We introduce the concepts of a symmetry-protected sign problem and symmetry-protected magic to study the complexity of symmetry-protected topological (SPT) phases of matter. In particular, w…

Category: Paper