Papers
Live trends in quantum computing research, updated daily from arXiv.
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Quantum error corrected non-Markovian metrology
Z. Mann, Ningping Cao, Raymond Laflamme +1 more·Mar 10, 2025
Quantum metrology aims to maximize measurement precision on quantum systems, with a wide range of applications in quantum sensing. Achieving the Heisenberg limit (HL) - the fundamental precision bound set by quantum mechanics - is often hindered by n...
Entanglement Transitions in Noisy Quantum Circuits on Trees
V. Ravindranath, Yiqiu Han, Xiao Chen·Mar 6, 2025
Decoherence is ubiquitous, and poses a significant impediment to the observation of quantum phenomena, such as the measurement-induced entanglement phase transition (MIPT). In this work, we study entanglement transitions in quantum circuits on trees,...
Calibrating magnetic flux control in superconducting circuits by compensating distortions on timescales from nanoseconds up to tens of microseconds
C. Hellings, N. Lacroix, A. Remm +8 more·Mar 6, 2025
Fast tuning of the transition frequency of superconducting qubits using magnetic flux is essential, for example, for realizing high-fidelity two-qubit gates with low leakage or for reducing errors in dispersive qubit readout. To apply accurately shap...
Measurement-Induced Crossover of Quantum Jump Statistics in Postselection-Free Many-Body Dynamics
Kazuki Yamamoto, Ryusuke Hamazaki·Mar 4, 2025
We reveal a nontrivial crossover of subsystem fluctuations of quantum jumps in continuously monitored many-body systems, which have a trivial maximally mixed state as a steady-state density matrix. While the fluctuations exhibit the standard volume l...
Negative exchange interaction in Si quantum dot arrays via valley-phase induced $\mathbb{Z}_2$ gauge field
Benjamin D. Woods·Mar 3, 2025
The exchange interaction $J$ offers a powerful tool for quantum computation based on semiconductor spin qubits. However, the exchange interaction in two-electron systems in the absence of a magnetic field is usually constrained to be non-negative $J ...
Universal quantum control with dynamical correction
Zhu-yao Jin, Jun Jing·Feb 27, 2025
Error correction is generally demanded in large-scale quantum information processing and quantum computation. We provide here a universal and realtime control strategy to dynamically correct the arbitrary type of errors in the system Hamiltonian. It ...
Enhancing quantum computations with the synergy of auxiliary field quantum Monte Carlo and computational basis tomography
V. Khinevich, Wataru Mizukami·Feb 27, 2025
We introduce QC-CBT-AFQMC, a hybrid algorithm that incorporates computational basis tomography (CBT) into the quantum-classical auxiliary-field quantum Monte Carlo (QC-AFQMC) method proposed by Huggins et al. [Nature 603, 416-420 (2022)], replacing t...
Time-adaptive single-shot crosstalk detector on superconducting quantum computer
Haiyue Kang, B. Harper, Muhammad Usman +1 more·Feb 20, 2025
Quantum crosstalk which stems from unwanted interference of quantum operations with nearby qubits is a major source of noise or errors in a quantum processor. In the context of shared quantum computing, it is challenging to mitigate the crosstalk eff...
Decoherence-induced self-dual criticality in topological states of matter
Qingyuan Wang, Romain Vasseur, Simon Trebst +2 more·Feb 19, 2025
Quantum measurements performed on a subsystem of a quantum many-body state can generate entanglement for its remaining constituents. The whole system including the measurement record is described by a hybrid mixed state, which can exhibit exotic phas...
Finite cutoff JT gravity: Baby universes, Matrix dual, and (Krylov) Complexity
Arpan Bhattacharyya, Saptaswa Ghosh, Sounak Pal +1 more·Feb 18, 2025
In this paper, as an application of the `Complexity = Volume' proposal, we calculate the growth of the interior of a black hole at late times for finite cutoff JT gravity. Due to this integrable, irrelevant deformation, the spectral properties are mo...
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 ...
Quantum Speed Limit and Quantum Thermodynamic Uncertainty Relation under Feedback Control
H. Yunoki, Y. Hasegawa·Feb 13, 2025
Fundamental trade-off relations, such as quantum speed limit and quantum thermodynamic uncertainty relation, describe the performance limits of quantum systems by imposing that improvements in speed or precision necessitate a substantial thermodynami...
Quantum nonlocal nonstabilizerness
Dongheng Qian, Jing Wang·Feb 10, 2025
Quantum entanglement and quantum nonstabilizerness are fundamental resources that characterize distinct aspects of a quantum state: entanglement reflects non-local correlations, while nonstabilizerness quantifies the deviation from stabilizer states....
Exceptional-Point-Induced Nonequilibrium Entanglement Dynamics in Bosonic Networks
Chenghe Yu, Mingsheng Tian, Ningxin Kong +3 more·Feb 7, 2025
Exceptional points (EPs), arising in non-Hermitian systems, have garnered significant attention in recent years, enabling advancements in sensing, wave manipulation, and mode selectivity. However, their role in quantum systems, particularly in influe...
Polarization entanglement and qubit error rate dependence on the exciton-phonon coupling in self-assembled quantum dots
Urmimala Dewan, Parvendra Kumar, Amarendra K. Sarma·Feb 5, 2025
Polarization-entangled photons are key resources for a wide range of protocols in quantum computation and quantum key distribution. Achieving a near-unity degree of polarization entanglement is essential for minimizing qubit error rates in secure key...
Gain compression in Josephson traveling-wave parametric amplifiers
Gwenael Le Gal, G. Butseraen, A. Ranadive +6 more·Feb 5, 2025
Superconducting traveling-wave parametric amplifiers (TWPAs) are increasingly used in various applications, including quantum computing, quantum sensing, and dark matter detection. However, one important characteristic of these amplifiers, gain compr...
Postselection-free experimental observation of the measurement-induced phase transition in circuits with universal gates
Xiaozhou Feng, Jeremy Cot'e, S. Kourtis +1 more·Feb 3, 2025
Monitored many-body systems can exhibit a phase transition between entangling and disentangling dynamical phases by tuning the strength of measurements made on the system as it evolves. This phenomenon is called the measurement-induced phase transiti...
Non-Markovian Quantum Jump Method for Driven-Dissipative Two-Level Systems
Huanyuan Zhang, Jiasen Jin·Feb 2, 2025
We propose a modified non-Markovian quantum jump method to overcome the obstacle of dramatically increased trajectory number in conventional quantum trajectory simulations. In our method the trajectories are classified into the trajectory classes cha...
Readout-induced leakage of the fluxonium qubit
Aayam Bista, Matthew Thibodeau, Ke Nie +3 more·Jan 29, 2025
Dispersive readout is widely used to perform high-fidelity measurement of superconducting qubits. Much work has been focused on the qubit readout fidelity, which depends on the achievable signal-to-noise ratio and the qubit relaxation time. As groups...
Disappearance of measurement-induced phase transition in a quantum spin system for large sizes
Paranjoy Chaki, Protyush Nandi, Ujjwal Sen +1 more·Jan 29, 2025
Measurement-induced phase transitions are often studied in random quantum circuits, with local measurements performed with a certain probability. We present here a model where a global measurement is performed with certainty at every time-step of the...