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…

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…

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…

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…

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…

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…

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…

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…

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…

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…

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…

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.…

Valentin Gebhart and Augusto Smerzi,

Quantum 7, 897 (2023).

Discarding undesirable measurement results in Bell experiments opens the detection loophole that prevents a conclusive demonstration of nonlocality. As closing the detection loophole represe…

Giancarlo Gatti, Daniel Huerga, Enrique Solano, and Mikel Sanz,

Quantum 7, 895 (2023).

We propose a protocol to encode classical bits in the measurement statistics of many-body Pauli observables, leveraging quantum correlations for a random access code. Measurement contexts bu…

Casper Gyurik, Dyon Vreumingen, van, and Vedran Dunjko,

Quantum 7, 893 (2023).

Quantum machine learning (QML) models based on parameterized quantum circuits are often highlighted as candidates for quantum computing's near-term “killer application''. However, the unders…

Xinyu Fei, Lucas T. Brady, Jeffrey Larson, Sven Leyffer, and Siqian Shen,

Quantum 7, 892 (2023).

Quantum control aims to manipulate quantum systems toward specific quantum states or desired operations. Designing highly accurate and effective control steps is vitally important to various…

Henry Yuen,

Quantum 7, 890 (2023).

We show that $\Omega(rd/\epsilon)$ copies of an unknown rank-$r$, dimension-$d$ quantum mixed state are necessary in order to learn a classical description with $1 – \epsilon$ fidelity. This improve…

Guy Braiman, Ori Reinhardt, Chen Mechel, Omer Levi, and Ido Kaminer,

Quantum 7, 888 (2023).

Recent advances in laser interactions with coherent free electrons have enabled to shape the electron's quantum state. Each electron becomes a superposition of energy levels on an infinite q…