Quantum – the open journal for quantum science

Quantum has published 912 Papers in 7 Volumes, as well as 71 Views in Quantum Views.

Call for editors 2023

In 2023 Quantum will celebrate 6 years since the first publications! From that first batch of papers, the journal grew to nearly 900 published articles. This growth was made possible by …

Paper

Improved quantum algorithms for linear and nonlinear differential equations

Hari Krovi,

Quantum 7, 913 (2023).

We present substantially generalized and improved quantum algorithms over prior work for inhomogeneous linear and nonlinear ordinary differential equations (ODE). Specifically, we show how t…

Paper

TensorCircuit: a Quantum Software Framework for the NISQ Era

Shi-Xin Zhang, Jonathan Allcock, Zhou-Quan Wan, Shuo Liu, Jiace Sun, Hao Yu, Xing-Han Yang, Jiezhong Qiu, Zhaofeng Ye, Yu-Qin Chen, Chee-Kong Lee, Yi-Cong Zheng, Shao-Kai Jian, Hong Yao, Chang-Yu Hsieh, and Shengyu Zhang,

Quantum 7, 912 (2023).

TensorCircuit is an open source quantum circuit simulator based on tensor network contraction, designed for speed, flexibility and code efficiency. Written purely in Python, and built on top…

Paper

Local hidden variable values without optimization procedures

Dardo Goyeneche, Wojciech Bruzda, Ondřej Turek, Daniel Alsina, and Karol Życzkowski,

Quantum 7, 911 (2023).

The problem of computing the local hidden variable (LHV) value of a Bell inequality plays a central role in the study of quantum nonlocality. In particular, this problem is the first step to…

Paper

Probing sign structure using measurement-induced entanglement

Cheng-Ju Lin, Weicheng Ye, Yijian Zou, Shengqi Sang, and Timothy H. Hsieh,

Quantum 7, 910 (2023).

The sign structure of quantum states is closely connected to quantum phases of matter, yet detecting such fine-grained properties of amplitudes is subtle. Here we employ as a diagnostic meas…

Universality in quantum snapshots

Pieter W. Claeys,

Quantum Views 7, 71 (2023).

Thermalization and random matrices One of the main challenges in quantum mechanics lies in understanding the dynamical behaviour of many-body systems. How do isolated quantum systems relax t…

Extending Quantum topological data analysis to persistent homology

Sam McArdle,

Quantum Views 7, 70 (2023).

It is an open challenge to design quantum algorithms for machine learning that do not need access to large amounts of data – the efficient loading of which would require challenging-t…

Paper

Variational quantum algorithm for unconstrained black box binary optimization: Application to feature selection

Christa Zoufal, Ryan V. Mishmash, Nitin Sharma, Niraj Kumar, Aashish Sheshadri, Amol Deshmukh, Noelle Ibrahim, Julien Gacon, and Stefan Woerner,

Quantum 7, 909 (2023).

We introduce a variational quantum algorithm to solve unconstrained black box binary optimization problems, i.e., problems in which the objective function is given as black box. This is in c…

Paper

Pulse based Variational Quantum Optimal Control for hybrid quantum computing

Robert de Keijzer, Oliver Tse, and Servaas Kokkelmans,

Quantum 7, 908 (2023).

This work studies pulse based variational quantum algorithms (VQAs), which are designed to determine the ground state of a quantum mechanical system by combining classical and quantum hardwa…

Paper

Persistent nonlocality in an ultracold-atom environment

Bradley Longstaff and Jonatan Bohr Brask,

Quantum 7, 907 (2023).

We investigate nonlocal quantum correlations arising between multiple two-level impurity atoms coupled to an ultracold bosonic gas. We find that the environment-induced dynamics of the impur…

Paper

Adaptive estimation of quantum observables

Ariel Shlosberg, Andrew J. Jena, Priyanka Mukhopadhyay, Jan F. Haase, Felix Leditzky, and Luca Dellantonio,

Quantum 7, 906 (2023).

The accurate estimation of quantum observables is a critical task in science. With progress on the hardware, measuring a quantum system will become increasingly demanding, particularly for v…

Paper

High-accuracy Hamiltonian learning via delocalized quantum state evolutions

Davide Rattacaso, Gianluca Passarelli, and Procolo Lucignano,

Quantum 7, 905 (2023).

Learning the unknown Hamiltonian governing the dynamics of a quantum many-body system is a challenging task. In this manuscript, we propose a possible strategy based on repeated measurements…

Paper

Remotely Controlled Entanglement Generation

Ferran Riera-Sàbat, Pavel Sekatski, and Wolfgang Dür,

Quantum 7, 904 (2023).

We consider a system of multiple qubits without any quantum control. We show that one can mediate entanglement between different subsystems in a controlled way by adding a (locally) controll…

Paper

Generation of highly retrievable atom photon entanglement with a millisecond lifetime via a spatially multiplexed cavity

Minjie Wang, Shengzhi Wang, Tengfei Ma, Ya Li, Yan Xie, Haole Jiao, Hailong Liu, Shujing Li, and Hai Wang,

Quantum 7, 903 (2023).

Qubit memory that is entangled with photonic qubit is the building block for long distance quantum repeaters. Cavity enhanced and long lived spin wave photon entanglement has been demonstrat…

Paper

Resonant Multilevel Amplitude Damping Channels

Stefano Chessa and Vittorio Giovannetti,

Quantum 7, 902 (2023).

We introduce a new set of quantum channels: resonant multilevel amplitude damping (ReMAD) channels. Among other instances, they can describe energy dissipation effects in multilevel atomic s…

Paper

Quantum Tokens for Digital Signatures

Shalev Ben-David and Or Sattath,

Quantum 7, 901 (2023).

The fisherman caught a quantum fish. "Fisherman, please let me go", begged the fish, "and I will grant you three wishes". The fisherman agreed. The fish gave the fisherman a quantum computer…

Paper

Contextuality in composite systems: the role of entanglement in the Kochen-Specker theorem

Victoria J Wright and Ravi Kunjwal,

Quantum 7, 900 (2023).

The Kochen–Specker (KS) theorem reveals the nonclassicality of single quantum systems. In contrast, Bell's theorem and entanglement concern the nonclassicality of composite quantum systems.…