Papers
Live trends in quantum computing research, updated daily from arXiv.
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13,386 papers in 12 months (-22% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Ruelle-Pollicott resonances of diffusive U(1)-invariant qubit circuits
Urban Duh, Marko Žnidarič·Jun 30, 2025
We study Ruelle-Pollicott resonances of translationally invariant magnetization-conserving qubit circuits via the spectrum of the quasi-momentum-resolved truncated propagator of extensive observables. Diffusive transport of the conserved magnetizatio...
State change via one-dimensional scattering in quantum mechanics
Olivia Pomerenk, Charles S. Peskin·Jun 30, 2025
This study aims to address the nature of state change, measurement, and probabilistic outcomes in non-relativistic quantum mechanics. We consider a pair of particles that interact in a one-dimensional setting via a delta-function potential. One of th...
Characterization of drive-induced unwanted state transitions in superconducting circuits
W. Dai, S. Hazra, D. K. Weiss +11 more·Jun 30, 2025
Microwave drives are essential for implementing control and readout operations in superconducting quantum circuits. However, increasing the drive strength eventually leads to unwanted state transitions which limit the speed and fidelity of such opera...
Quantum state transfer and periodicity in discrete-time quantum walks under non--Markovian dephasing noise
Monika Rani, Supriyo Dutta, Subhashish Banerjee·Jun 30, 2025
In quantum communication, quantum state transfer from one location to another in a quantum network plays a prominent role, where the impact of noise could be crucial. The idea of state transfer can be fruitfully associated with quantum walk on graphs...
Phase-Space Topology in a Single-Atom Synthetic Dimension
Kyungmin Lee, Sunkyu Yu, Jiyong Kang +5 more·Jun 30, 2025
We investigate topological features in the synthetic Fock-state lattice (FSL) of a single-atom system described by the quantum Rabi model. By diagonalizing the Hamiltonian, we identify a zero-energy defect state localized at a domain wall of the FSL,...
Finite Gaussian assistance protocols and a conic metric for extremizing spacelike vacuum entanglement
Boyu Gao, Natalie Klco·Jun 30, 2025
In a pure Gaussian tripartition, a range of entanglement between two parties ($AB$) can be purified through classical communication of Gaussian measurements performed within the third ($C$). To begin, this work introduces a direct method to calculate...
Topologically noise robust network steering without inputs
Dhruv Baheti, Shubhayan Sarkar·Jun 30, 2025
Quantum networks with independent sources allow observing quantum nonlocality or steering with just a single measurement per node of the network, or without any inputs. Inspired by the recently introduced notion of swap-steering, we consider here the...
Multi-Target Density Matrix Renormalization Group X algorithm and its application to circuit quantum electrodynamics
Sof'ia Gonz'alez-Garc'ia, A. Szasz, Alice Pagano +3 more·Jun 30, 2025
Obtaining accurate representations of the eigenstates of an array of coupled superconducting qubits is a crucial step in the design of circuit quantum electrodynamics (QED)-based quantum processors. However, exact diagonalization of the device Hamilt...
Realignment Criterion: A necessary and sufficient condition for two-qubit $X$-states
A. Gogia, A. Bagga, Satyabrata Adhikari +1 more·Jun 30, 2025
The Computable Cross Norm (CCN), or realignment criterion, is a widely used method for entanglement detection in quantum systems; however, it typically provides only a necessary condition. In this work, we advance the applicability of the realignment...
Optimal Quantum Algorithm for Estimating Fidelity to a Pure State
Wang Fang, Qisheng Wang·Jun 30, 2025
We present an optimal quantum algorithm for fidelity estimation between two quantum states when one of them is pure. In particular, the (square root) fidelity of a mixed state to a pure state can be estimated to within additive error $\varepsilon$ by...
Vortex Detection from Quantum Data
Chelsea A. Williams, Annie E. Paine, A. A. Gentile +2 more·Jun 30, 2025
Quantum solutions to differential equations represent quantum data -- states that contain relevant information about the system's behavior, yet are difficult to analyze. We propose a toolbox for reading out information from such data, where customize...
Quantum phase transitions and entanglement entropy in a non-Hermitian Jaynes-Cummings model
Gargi Das, Aritra Ghosh, Bhabani Prasad Mandal·Jun 29, 2025
In this paper, we describe some interesting properties of a non-Hermitian Jaynes-Cummings model. For this particular model, it is known that the Hilbert space can be described by infinitely-many two-dimensional invariant (closed) subspaces, together ...
Bending hyperplanes: nonlinear entanglement witnesses via envelopes of linear witnesses
AmirHossein Tangestaninejad, Vahid Karimipour·Jun 29, 2025
Entanglement witnesses (EWs) are fundamental tools for detecting entanglement. However traditional linear witnesses often fail to identify most of the entangled states. In this work, we construct a family of nonlinear entanglement witnesses by taking...
Quantum Physics-Informed Neural Networks for Maxwell's Equations: Circuit Design, "Black Hole" Barren Plateaus Mitigation, and GPU Acceleration
Ziv Chen, Gal G. Shaviner, Hemanth Chandravamsi +3 more·Jun 29, 2025
Physics-Informed Neural Networks (PINNs) have emerged as a promising approach for solving partial differential equations (PDEs) by embedding the governing physics into the loss function associated with a deep neural network. In this work, a Quantum P...
Single Qudit Control in $^{87}$Sr via Optical Nuclear Electric Resonance
Johannes K. Krondorfer, Matthias Diez, Andreas W. Hauser·Jun 29, 2025
Optical nuclear electric resonance (ONER) was recently proposed as a fast and robust single-qubit gate mechanism in $^{87}$Sr. Here, we demonstrate through numerical simulations that ONER can be extended to single-qudit control, addressing multiple o...
Fault-tolerant dynamically-decoupled hyper-Ramsey spectroscopy of ultra-narrow clock transitions
T. Zanon-Willette, B. Ilikj, D. Wilkowski +2 more·Jun 29, 2025
Hyper-Ramsey protocols effectively reduce AC-Stark shifts in probing ultra-narrow optical clock transitions but they remain sensitive to laser intensity noise, decoherence, frequency drifts, and low-frequency perturbations. We address these limitatio...
Quantum Computing Architecture and Hardware for Engineers
H. Y. Wong·Jun 29, 2025
After publishing my book"Quantum Computing Architecture and Hardware for Engineers: Step by Step"[1] (now I call it Volume I), in which spin qubit and superconducting qubit quantum computers were covered, I decided to continue to write the second vol...
Performance-centric roadmap for building a superconducting quantum computer
R. Barends, F. K. Wilhelm·Jun 29, 2025
One of the outstanding challenges in contemporary science and technology is building a quantum computer that is useful in applications. By starting from an estimate of the algorithm success rate, we can explicitly connect gate fidelity to quantum s...
Some Mathematical Problems Behind Lattice-Based Cryptography
Chuanming Zong·Jun 29, 2025
In 1994, P. Shor discovered quantum algorithms that can break both the RSA cryptosystem and the ElGamal cryptosystem. In 2007, D-Wave demonstrated the first quantum computer. These events and further developments have brought a crisis to secret commu...
On the polemic assessment of what Bell did
Justo Pastor Lambare·Jun 28, 2025
Despite their Nobel Prize-winning empirical falsification, the interpretation of Bell's inequality remains a subject of controversy. This article discusses and attempts to clarify the reasons John S. Bell and A. Einstein claimed that quantum entangle...