Papers

Juan Garcia Nila, Todd A. Brun·May 23, 2025

We investigate continuous quantum error correction, comparing performance under a Markovian error model to two distinct non-Markovian models. The first non-Markovian model involves an interaction Hamiltonian between the system and an environmental qu...

Qianxu Wang, Sara Magdalena G'omez, J. Salcedo-Gallo +6 more·May 23, 2025

Two-level system (TLS) defects in dielectrics cause decoherence in superconducting circuits, yet their origin, frequency distribution, and dipole moments remain poorly understood. Current probes, primarily based on qubits or resonators, require compl...

Abhishek Muhuri, Ayan Patra, Rivu Gupta +2 more·May 22, 2025

We analyze the security of two-way quantum key distribution using arbitrary finite-dimensional systems, considering both individual and collective eavesdropping attacks, without the effective use of entangled states, by incorporating two mutually unb...

Fabio Deelan Cunden, Giovanni Gramegna, Marilena Ligabò·May 22, 2025

We consider a free quantum particle in one dimension whose mass profile exhibits jump discontinuities. The corresponding Hamiltonian is a self-adjoint realisation of the kinetic-energy operator, with the specific realisation determined by the boundar...

Marcelo Janovitch, Matteo Brunelli, Patrick P. Potts·May 22, 2025

Quantum reservoir engineering leverages dissipative processes to achieve desired behavior, with applications ranging from entanglement generation to quantum error correction. Therein, a structured environment acts as an entropy sink for the system an...

Michael Lubasch, Yuta Kikuchi, Lewis Wright +1 more·May 22, 2025

For the solution of partial differential equations (PDEs), we show that the quantum Fourier transform (QFT) can enable the design of quantum circuits that are particularly simple, both conceptually and with regard to hardware requirements. This is sh...

Hai-Feng Zhang, Zhao-Yun Chen, Peng Wang +17 more·May 22, 2025

Quantum machine learning (QML) models, like their classical counterparts, are vulnerable to adversarial attacks, hindering their secure deployment. Here, we report the first systematic experimental robustness benchmark for 20-qubit quantum neural net...

Anthony Leverrier·May 22, 2025

While 2-level systems, aka qubits, are a natural choice to perform a logical quantum computation, the situation is less clear at the physical level. Encoding information in higher-dimensional physical systems can indeed provide a first level of redun...

Baibhab Bose, Devvrat Tiwari, Subhashish Banerjee·May 22, 2025

The theory of an $η$-pseudo Hermitian Hamiltonian with $\mathcal{PT}$ symmetry is reviewed and extended to include open system dynamics. A first-principles derivation of the generalized Gorini-Kossakowski-Sudarshan-Lindblad master equation appropriat...

Atsuya Hasegawa, François Le Gall, Augusto Modanese·May 22, 2025

We present relation problems whose input size is $n$ such that they can be solved with no communication for entanglement-assisted quantum communication models, but require $Ω(n)$ qubit communication for $2$-way quantum communication models without pr...

Jonas Stein, Jannis Lutz, Moritz Sölderer +4 more·May 22, 2025

Quantum Simulation-based Optimization (QuSO) is a recently proposed class of optimization problems that entails industrially relevant problems characterized by cost functions or constraints that depend on summary statistic information about the simul...

Xu-Dan 旭丹 Xie 谢, Zheng-Yuan 正远 Xue 薛, Dan-Bo 旦波 Zhang 张·May 22, 2025

In open quantum systems, the Liouvillian gap characterizes the relaxation time toward the steady state. However, accurately computing this quantity is notoriously difficult due to the exponential growth of the Hilbert space and the non-Hermitian natu...

Chiara Capecci, Gopal Chandra Santra, Alberto Bottarelli +2 more·May 22, 2025

Quantum optimization has emerged as a promising approach for tackling complicated classical optimization problems using quantum devices. However, the extent to which such algorithms harness genuine quantum resources and the role of these resources in...

Homer A. Riva-Cambrin, Rahul Singh, S. Lama +1 more·May 22, 2025

Cryptography underpins the security of modern digital infrastructure, from cloud services to health data. However, many widely deployed systems will become vulnerable after the advent of scalable quantum computing. Although quantum-safe cryptographic...

J. Patterson, William J. Buchanan, Callum Turino·May 22, 2025

The emergence of quantum computing and Shor’s algorithm necessitates an imminent shift from current public key cryptography techniques to post-quantum-robust techniques. The NIST has responded by standardising Post-Quantum Cryptography (PQC) algorith...

Jing Li, Yanqi Song, Su-Lu Qin +1 more·May 22, 2025

Kernel methods serve as powerful tools to capture nonlinear patterns behind data in machine learning. The quantum kernel, integrating kernel theory with quantum computing, has attracted widespread attention. However, existing studies encounter perfor...

Ruizhe Shen, Tianqi Chen, Ching Hua Lee·May 22, 2025

Developing methods to accurately characterize and mitigate the impact of noise is crucial for enhancing the fidelity of quantum simulations on Noisy Intermediate-Scale Quantum (NISQ) devices. In this work, we present a circuit structure-preserving er...

Yun-Cheng Tsai, Samuel Yen-Chi Chen·May 22, 2025

Blockchain transaction data exhibits high dimensionality, noise, and intricate feature entanglement, presenting significant challenges for traditional clustering algorithms. In this study, we conduct a comparative analysis of three clustering approac...

Abhinav Muraleedharan, Nathan Wiebe·May 22, 2025

We present quantum algorithms for simulating the dynamics of a broad class of classical oscillator systems containing $2^n$ coupled oscillators (Eg: $2^n$ masses coupled by springs), including those with time-dependent forces, time-varying stiffness ...

Chenghong Zhu, Xian Wu, Zhaohui Yang +4 more·May 22, 2025

Quantum hardware development is progressing rapidly with substantial advancements achieved across leading platforms, including superconducting circuits, trapped-ion systems, and neutral atom arrays. As the pursuit of practical quantum advantage conti...