Quantum

Quantum has published 2260 Papers in 10 Volumes, as well as 87 Views in Quantum Views.

Indefinite Time Directed Quantum Metrology

Gaurang Agrawal, Pritam Halder, and Aditi SenDe,

Quantum 9, 1785 (2025).

We explore the performance of the metrology scheme by employing a quantum time flip during encoding, a specific case of processes with indefinite time direction, which we refer to as indefin…

Paper

Sampling Groups of Pauli Operators to Enhance Direct Fidelity Estimation

Júlia Barberà-Rodríguez, Mariana Navarro, and Leonardo Zambrano,

Quantum 9, 1784 (2025).

Direct fidelity estimation is a protocol that estimates the fidelity between an experimental quantum state and a target pure state. By measuring the expectation values of Pauli operators sel…

General

Policy Update: New editorial onboarding and review procedures

Dear Quantum Community, We wanted to provide an update and announce a new attempt to improve the quality of peer review procedures in Quantum. TL;DR: from now on, instead of …

Paper

Subsystem Information Capacity in Random Circuits and Hamiltonian Dynamics

Yu-Qin Chen, Shuo Liu, and Shi-Xin Zhang,

Quantum 9, 1783 (2025).

In this study, we explore the information capacity of open quantum systems, focusing on the effective channels formed by the subsystem of random quantum circuits and quantum Hamiltonian evol…

Paper

Stabilizer ground states for simulating quantum many-body physics: theory, algorithms, and applications

Jiace Sun, Lixue Cheng, and Shi-Xin Zhang,

Quantum 9, 1782 (2025).

Stabilizer states, which are also known as the Clifford states, have been commonly utilized in quantum information, quantum error correction, and quantum circuit simulation due to their simp…

Paper

Breakdown of Measurement-Induced Phase Transitions Under Information Loss

Alessio Paviglianiti, Giovanni Di Fresco, Alessandro Silva, Bernardo Spagnolo, Davide Valenti, and Angelo Carollo,

Quantum 9, 1781 (2025).

The dynamics of a quantum-many body system subject to measurements is naturally described by an ensemble of quantum trajectories, which can feature measurement-induced phase transitions (MIP…

Paper

On the composable security of weak coin flipping

Jiawei Wu, Yanglin Hu, Akshay Bansal, and Marco Tomamichel,

Quantum 9, 1780 (2025).

Weak coin flipping is a cryptographic primitive in which two mutually distrustful parties generate a shared random bit to agree on a winner via remote communication. While a stand-alone secu…

Paper

Logical Noise Bias in Magic State Injection

Nicholas Fazio, Robin Harper, and Stephen D. Bartlett,

Quantum 9, 1779 (2025).

Fault-tolerant architectures aim to reduce the noise of a quantum computation. Despite such architectures being well studied a detailed understanding of how noise is transformed in a fault-t…

Paper

Characterizing maximally many-body entangled fermionic states by using $M$-body density matrix

Irakli Giorgadze, Haixuan Huang, Jordan Gaines, Elio J. König, and Jukka I. Väyrynen,

Quantum 9, 1778 (2025).

Fermionic Hamiltonians play a critical role in quantum chemistry, one of the most promising use cases for near-term quantum computers. However, since encoding nonlocal fermionic statistics u…

Paper

Improved Quantum Query Upper Bounds Based on Classical Decision Trees

Arjan Cornelissen, Nikhil S. Mande, and Subhasree Patro,

Quantum 9, 1777 (2025).

Given a classical query algorithm as a decision tree, when does there exist a quantum query algorithm with a speed-up over the classical one? We provide a general construction based on the s…

Paper

Modular quantum signal processing in many variables

Zane M. Rossi, Jack L. Ceroni, and Isaac L. Chuang,

Quantum 9, 1776 (2025).

Despite significant advances in quantum algorithms, quantum programs in practice are often expressed at the circuit level, forgoing helpful structural abstractions common to their classical…

Paper

Generalizing the matching decoder for the Chamon code

Zohar Schwartzman-Nowik and Benjamin J. Brown,

Quantum 9, 1775 (2025).

Different choices of quantum error-correcting codes can reduce the demands on the physical hardware needed to build a quantum computer. To achieve the full potential of a code, we must devel…

Paper

Family of attainable geometric quantum speed limits

Zi-yi Mai, Zheng Liu, and Chang-shui Yu,

Quantum 9, 1774 (2025).

We propose a quantum state distance and develop a family of geometrical quantum speed limits (QSLs) for open and closed systems. The QSL time includes an alternative function by which we der…

Paper

Simulating Meson Scattering on Spin Quantum Simulators

Elizabeth R. Bennewitz, Brayden Ware, Alexander Schuckert, Alessio Lerose, Federica M. Surace, Ron Belyansky, William Morong, De Luo, Arinjoy De, Kate S. Collins, Or Katz, Christopher Monroe, Zohreh Davoudi, and Alexey V. Gorshkov,

Quantum 9, 1773 (2025).

Studying high-energy collisions of composite particles, such as hadrons and nuclei, is an outstanding goal for quantum simulators. However, preparation of hadronic wave packets has posed a s…

Paper

Accurate neural quantum states for interacting lattice bosons

Zakari Denis and Giuseppe Carleo,

Quantum 9, 1772 (2025).

In recent years, neural quantum states have emerged as a powerful variational approach, achieving state-of-the-art accuracy when representing the ground-state wave function of a great variet…

Paper

Exact, Average, and Broken Symmetries in a Simple Adaptive Monitored Circuit

Zhi Li and Zhu-Xi Luo,

Quantum 9, 1771 (2025).

Symmetry is a powerful tool for understanding phases of matter in equilibrium. Quantum circuits with measurements have recently emerged as a platform for novel states of matter intrinsically…