Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Pauli Measurements Are Not Optimal for Single-Copy Tomography
Jayadev Acharya, Abhilash Dharmavarapu, Yuhan Liu +1 more·Feb 25, 2025
Quantum state tomography is a fundamental problem in quantum computing. Given n copies of an unknown N-qubit state ρ∈ℂd× d,d=2N, the goal is to learn the state up to an accuracy ε in trace distance, say with at least constant probability 0.99. We are...
Quantum-Safe integration of TLS in SDN networks
Jaime S. Buruaga, Rub'en B. M'endez, J. P. Brito +1 more·Feb 24, 2025
Shor's algorithm efficiently solves factoring and discrete logarithm problems using quantum computers, compromising all public key schemes used today. These schemes rely on assumptions on their computational complexity, which quantum computers can ea...
Beyond NISQ: The Megaquop Machine
J. Preskill·Feb 24, 2025
Today’s Noisy Intermediate-Scale Quantum (NISQ) computers have scientific value, but quantum machines with broad practical value must be protected against noise using quantum error correction and fault-tolerant protocols. Recent studies of quantum er...
Information-theoretic principle of emergent 1-form symmetries
Yu-Jie Liu, Wen-Tao Xu, Frank Pollmann +1 more·Feb 24, 2025
Higher-form symmetries act on sub-dimensional spatial manifolds of a quantum system. They can emerge as an exact symmetry at low energies even when they are explicitly broken at the microscopic level, making them difficult to characterize. In this wo...
Existence and Characterisation of Bivariate Bicycle Codes
Jasper Johannes Postema, Servaas J. J. M. F. Kokkelmans·Feb 24, 2025
Encoding quantum information in a quantum error correction (QEC) code offers protection against decoherence and enhances the fidelity of qubits and gate operations. One of the fundamental challenges of QEC is to construct codes with asymptotically go...
Adaptive Non-Gaussian Quantum State Engineering
Valerio Crescimanna, Shang Yu, Khabat Heshami +1 more·Feb 20, 2025
Non-Gaussian quantum states of bosons are a key resource in quantum information science with applications ranging from quantum metrology to fault-tolerant quantum computation. Generation of photonic non-Gaussian resource states, such as Schrödinger's...
Quantum computer formulation of the FKP-operator eigenvalue problem for probabilistic learning on manifolds
Christian Soize, Loïc Joubert-Doriol, A. Izmaylov·Feb 20, 2025
We present a quantum computing formulation to address a challenging problem in the development of probabilistic learning on manifolds (PLoM). It involves solving the spectral problem of the high-dimensional Fokker-Planck (FKP) operator, which remains...
Provable Quantum Algorithm Advantage for Gaussian Process Quadrature
Cristian A. Galvis-Florez, Ahmad Farooq, Simo Särkkä·Feb 20, 2025
The aim of this paper is to develop novel quantum algorithms for Gaussian process quadrature methods. Gaussian process quadratures are numerical integration methods where Gaussian processes are used as functional priors for the integrands to capture ...
PQBFL: A Post-Quantum Blockchain-based Protocol for Federated Learning
Hadi Gharavi, J. Granjal, Edmundo Monteiro·Feb 20, 2025
One of the goals of Federated Learning (FL) is to collaboratively train a global model using local models from remote participants. However, the FL process is susceptible to various security challenges, including interception and tampering models, in...
Discovering highly efficient low-weight quantum error-correcting codes with reinforcement learning
Austin Yubo He, Zi-Wen Liu·Feb 20, 2025
The realization of scalable fault-tolerant quantum computing is expected to hinge on quantum error-correcting codes. In the quest for more efficient quantum fault tolerance, a critical code parameter is the weight of measurements that extract informa...
Adaptive syndrome extraction
Noah F. Berthusen, Shi Jie Samuel Tan, Eric Huang +1 more·Feb 20, 2025
Device error rates on current quantum computers have improved enough to where demonstrations of error correction below break-even are now possible. Still, the circuits required for quantum error correction introduce significant overhead and sometimes...
Measurement-device-independent Schmidt number certification of all entangled states
Saheli Mukherjee, Bivas Mallick, Arun Kumar Das +2 more·Feb 18, 2025
Bipartite quantum states with higher Schmidt numbers have been shown to outperform those with lower Schmidt numbers in various quantum information processing tasks, highlighting the operational advantage of entanglement dimensionality. Certifying the...
Observable and computable entanglement in time
Alexey Milekhin, Zofia Adamska, John Preskill·Feb 17, 2025
We propose a novel family of entanglement measures for time-separated subsystems. Our definitions are applicable to any quantum system, continuous or discrete. To illustrate their utility, we derive upper and lower bounds on time-separated correlatio...
Unitality Conditions on Subsystems in Quantum Dynamics
Anumita Mukhopadhyay, Shibdas Roy, A. K. Pati·Feb 17, 2025
It is known that non-unital noise such as the amplitude damping can sometimes increase quantum correlations, while unital noise such as the dephasing usually decreases quantum correlations. It is, therefore, important to delineate the conditions, whe...
The Q-Spellbook: Crafting Surface Code Layouts and Magic State Protocols for Large-Scale Quantum Computing
Avimita Chatterjee, Archisman Ghosh, Swaroop Ghosh·Feb 16, 2025
Quantum error correction is a cornerstone of reliable quantum computing, with surface codes emerging as a prominent method for protecting quantum information. Surface codes are efficient for Clifford gates but require magic state distillation protoco...
Error-mitigated entanglement-assisted quantum process tomography
Zhihao Wu, Lingling Lao, Chengqi Zhuke +6 more·Feb 15, 2025
In the era of noisy intermediate-scale quantum computing, it is of crucial importance to verify quantum processes and extract information. Quantum process tomography is a typical approach, however, both resource-intensive and vulnerable to state prep...
Nonreciprocal routing induced by chirality in an atom-dimer waveguide-QED system
Shi-Yu Liu, Lin-Lin Jiang, Hai Zhu +2 more·Feb 14, 2025
The implementation of quantum routers is an important and desired task in quantum information science, since quantum routers are important components of quantum networks. Here, we propose a scheme for implementing single-photon routers in a waveguide...
SWAP Attack: Stealthy Side-Channel Attack on Multi-Tenant Quantum Cloud System
Wei Jie Bryan Lee, Siyi Wang, Suman Dutta +2 more·Feb 14, 2025
The rapid advancement of quantum computing has spurred widespread adoption, with cloud-based quantum devices gaining traction in academia and industry. This shift raises critical concerns about the privacy and security of computations on shared, mult...
Weak continuous measurements require more work than strong ones
Lorena Ballesteros Ferraz, Cyril Elouard·Feb 13, 2025
Understanding the energy cost of quantum measurement process and its connection to the measurement performance faces the challenge of modeling the objectification process. The latter, turns the measurement result into an objective fact, available to ...
Constant Overhead Entanglement Distillation via Scrambling
Andi Gu, Lorenzo Leone, Kenneth Goodenough +1 more·Feb 13, 2025
High-fidelity quantum entanglement enables key quantum networking capabilities such as secure communication and distributed quantum computing, but long-distance entanglement distribution is limited by noise and loss. Entanglement distillation protoco...