Quantum

Paper

General properties of fidelity in non-Hermitian quantum systems with PT symmetry

Yi-Ting Tu, Iksu Jang, Po-Yao Chang, and Yu-Chin Tzeng,

Quantum 7, 960 (2023).

The fidelity susceptibility is a tool for studying quantum phase transitions in the Hermitian condensed matter systems. Recently, it has been generalized with the biorthogonal basis for the…

Paper

Hybrid divide-and-conquer approach for tree search algorithms

Mathys Rennela, Sebastiaan Brand, Alfons Laarman, and Vedran Dunjko,

Quantum 7, 959 (2023).

One of the challenges of quantum computers in the near- and mid- term is the limited number of qubits we can use for computations. Finding methods that achieve useful quantum improvements un…

Paper

Quantum States of Fields for Quantum Split Sources

Lin-Qing Chen, Flaminia Giacomini, and Carlo Rovelli,

Quantum 7, 958 (2023).

Field mediated entanglement experiments probe the quantum superposition of macroscopically distinct field configurations. We show that this phenomenon can be described by using a transparent…

Paper

Universal construction of decoders from encoding black boxes

Satoshi Yoshida, Akihito Soeda, and Mio Murao,

Quantum 7, 957 (2023).

Isometry operations encode the quantum information of the input system to a larger output system, while the corresponding decoding operation would be an inverse operation of the encoding iso…

Paper

Optimal (controlled) quantum state preparation and improved unitary synthesis by quantum circuits with any number of ancillary qubits

Pei Yuan and Shengyu Zhang,

Quantum 7, 956 (2023).

As a cornerstone for many quantum linear algebraic and quantum machine learning algorithms, controlled quantum state preparation (CQSP) aims to provide the transformation of…

Paper

Time-marching based quantum solvers for time-dependent linear differential equations

Di Fang, Lin Lin, and Yu Tong,

Quantum 7, 955 (2023).

The time-marching strategy, which propagates the solution from one time step to the next, is a natural strategy for solving time-dependent differential equations on classical computers, as w…

Paper

Efficient separation of quantum from classical correlations for mixed states with a fixed charge

Christian Carisch and Oded Zilberberg,

Quantum 7, 954 (2023).

Entanglement is the key resource for quantum technologies and is at the root of exciting many-body phenomena. However, quantifying the entanglement between two parts of a real-world quantum…

Paper

Quantum Contextuality

Mladen Pavicic,

Quantum 7, 953 (2023).

Quantum contextual sets have been recognized as resources for universal quantum computation, quantum steering and quantum communication. Therefore, we focus on engineering the sets that supp…

Paper

Parity Quantum Optimization: Benchmarks

Michael Fellner, Kilian Ender, Roeland ter Hoeven, and Wolfgang Lechner,

Quantum 7, 952 (2023).

We present benchmarks of the parity transformation for the Quantum Approximate Optimization Algorithm (QAOA). We analyse the gate resources required to implement a single QAOA cycle for real…

Paper

Parity Quantum Optimization: Encoding Constraints

Maike Drieb-Schön, Kilian Ender, Younes Javanmard, and Wolfgang Lechner,

Quantum 7, 951 (2023).

Constraints make hard optimization problems even harder to solve on quantum devices because they are implemented with large energy penalties and additional qubit overhead. The parity mapping…

Paper

Parity Quantum Optimization: Compiler

Kilian Ender, Roeland ter Hoeven, Benjamin E. Niehoff, Maike Drieb-Schön, and Wolfgang Lechner,

Quantum 7, 950 (2023).

We introduce parity quantum optimization with the aim of solving optimization problems consisting of arbitrary $k$-body interactions and side conditions using planar quantum chip architectures…

Paper

Latency considerations for stochastic optimizers in variational quantum algorithms

Matt Menickelly, Yunsoo Ha, and Matthew Otten,

Quantum 7, 949 (2023).

Variational quantum algorithms, which have risen to prominence in the noisy intermediate-scale quantum setting, require the implementation of a stochastic optimizer on classical hardware. To…

Paper

A mathematical framework for operational fine tunings

Lorenzo Catani and Matthew Leifer,

Quantum 7, 948 (2023).

In the framework of ontological models, the inherently nonclassical features of quantum theory always seem to involve properties that are fine tuned, i.e. properties that hold at the operati…

Paper

Quantum Correlations in the Minimal Scenario

Thinh P. Le, Chiara Meroni, Bernd Sturmfels, Reinhard F. Werner, and Timo Ziegler,

Quantum 7, 947 (2023).

In the minimal scenario of quantum correlations, two parties can choose from two observables with two possible outcomes each. Probabilities are specified by four marginals and four correlati…

Paper

Gravitational time dilation as a resource in quantum sensing

Carlo Cepollaro, Flaminia Giacomini, and Matteo G.A. Paris,

Quantum 7, 946 (2023).

Atomic clock interferometers are a valuable tool to test the interface between quantum theory and gravity, in particular via the measurement of gravitational time dilation in the quantum reg…

Paper

Practical computational advantage from the quantum switch on a generalized family of promise problems

Jorge Escandón-Monardes, Aldo Delgado, and Stephen P. Walborn,

Quantum 7, 945 (2023).

The quantum switch is a quantum computational primitive that provides computational advantage by applying operations in a superposition of orders. In particular, it can reduce the number of…

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