Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Measurement-induced phase transitions by matrix product states scaling
Guillaume Cecile, Hugo Lóio, J. De Nardis·Feb 20, 2024
We study the time evolution of long quantum spin chains subjected to continuous monitoring projected on matrix product states (MPS) with fixed bond dimension, by means of the Time-Dependent Variational Principle (TDVP) algorithm. The latter gives an ...
Beyond unital noise in variational quantum algorithms: noise-induced barren plateaus and limit sets
P. Singkanipa, Daniel A. Lidar·Feb 13, 2024
Variational quantum algorithms (VQAs) hold much promise but face the challenge of exponentially small gradients. Unmitigated, this barren plateau (BP) phenomenon leads to an exponential training overhead for VQAs. Perhaps the most pernicious are nois...
Measurement-Induced Transmon Ionization
Marie Frédérique Dumas, Benjamin Groleau-Par'e, Alexander McDonald +4 more·Feb 9, 2024
Despite the high measurement fidelity that can now be reached, the dispersive qubit readout of circuit quantum electrodynamics is plagued by a loss of its quantum nondemolition character and a decrease in fidelity with increased measurement strength....
Monitoring the Energy of a Cavity by Observing the Emission of a Repeatedly Excited Qubit.
Hector Hutin, Antoine Essig, R. Assouly +3 more·Feb 7, 2024
The number of excitations in a large quantum system (harmonic oscillator or qudit) can be measured in a quantum nondemolition manner using a dispersively coupled qubit. It typically requires a series of qubit pulses that encode various binary questio...
Cosmic-ray-induced correlated errors in superconducting qubit array
Xue-Gang Li, Junhua Wang, Yao-Yao Jiang +15 more·Feb 6, 2024
Correlated errors may devastate quantum error corrections that are necessary for the realization of fault-tolerant quantum computation. Recent experiments with superconducting qubits indicate that they can arise from quasiparticle (QP) bursts induced...
High temperature spin selectivity in a quantum dot qubit using reservoir spin accumulation
R. Jansen, S. Yuasa·Feb 3, 2024
Employing spins in quantum dots for fault-tolerant quantum computing in large-scale qubit arrays with on-chip control electronics requires high-fidelity qubit operation at elevated temperature. This poses a challenge for single spin initialization an...
In Situ‐Tunable Spin–Spin Interactions in a Penning Trap with In‐Bore Optomechanics
Joseph H. Pham, Julian Y. Z. Jee, A. Rischka +2 more·Jan 31, 2024
Experimental implementations of quantum simulation must balance control‐field‐induced decoherence with the controllability of the quantum system. The ratio of coherent interaction strength to decoherence induced by stimulated emission in atomic syste...
Tapestry of dualities in decohered quantum error correction codes
Kaixiang Su, Zhou Yang, Chao-Ming Jian·Jan 30, 2024
Quantum error correction (QEC) codes protect quantum information from errors due to decoherence. Many of them also serve as prototypical models for exotic topological quantum matters. Investigating the behavior of the QEC codes under decoherence shed...
Symmetry-Enforced Quadratic Degradability Beyond Low Dimensions
Yun-Feng Lo, Yen-Chi Lee, Min-Hsiu Hsieh·Jan 29, 2024
Approximate degradability provides a powerful framework for bounding the quantum and private capacities of noisy quantum channels in regimes where exact degradability fails. While generic low-noise channels exhibit a non-degradability parameter that ...
Advantage of Quantum Neural Networks as Quantum Information Decoders
Weishun Zhong, O. Shtanko, R. Movassagh·Jan 11, 2024
A promising strategy to protect quantum information from noise-induced errors is to encode it into the low-energy states of a topological quantum memory device. However, readout errors from such memory under realistic settings is less understood. We ...
Machine-learning optimal control pulses in an optical quantum memory experiment
Elizabeth Robertson, Luisa Esguerra, Leon Meßner +2 more·Jan 10, 2024
Efficient optical quantum memories are a milestone required for several quantum technologies including repeater-based quantum key distribution and on-demand multi-photon generation. We present an efficiency optimization of an optical electromagnetica...
Wafer-scale CMOS-compatible graphene Josephson field-effect transistors
A. A. Generalov, K. Viisanen, J. Senior +5 more·Jan 10, 2024
Electrostatically tunable Josephson field-effect transistors (JoFETs) are one of the most desired building blocks of quantum electronics. Applications of JoFETs range from parametric amplifiers and superconducting qubits to a variety of integrated su...
Efficient Decoupling of a Nonlinear Qubit Mode from Its Environment
F. Pfeiffer, M. Werninghaus, C. Schweizer +21 more·Dec 28, 2023
To control and measure the state of a quantum system, it must necessarily be coupled to external degrees of freedom. This inevitably leads to spontaneous emission via the Purcell effect, photon-induced dephasing from measurement backaction, and error...
Which Options Exist for NISQ-Friendly Linear Response Formulations?
K. M. Ziems, E. Kjellgren, Peter Reinholdt +4 more·Dec 21, 2023
Linear response (LR) theory is a powerful tool in classic quantum chemistry crucial to understanding photoinduced processes in chemistry and biology. However, performing simulations for large systems and in the case of strong electron correlation rem...
Understanding disorder in silicon quantum computing platforms: Scattering mechanisms in Si/SiGe quantum wells
Yi Huang, S. Das Sarma·Dec 12, 2023
Motivated by recent experiments on Si/SiGe quantum wells with a co-design of high electron mobility and large valley splitting [B. Paquelet Wuetz, et al., Nature Communications 14, 1385 (2023); D. D. Esposti, et al., arXiv:2309.02832], suitable for a...
Dephasing due to electromagnetic interactions in spatial qubits
M. Schut, Herre Bosma, Meng-Zhi Wu +3 more·Dec 9, 2023
Matter-wave interferometers with micro-particles will enable the next generation of quantum sensors to probe minute quantum phase information. Therefore, estimating the loss of coherence and the degree of entanglement degradation for such interferome...
Large Spin Stern-Gerlach Interferometry for Gravitational Entanglement
Lorenzo Braccini, M. Schut, Alessio Serafini +2 more·Dec 8, 2023
Recently, there has been a proposal to test the quantum nature of gravity in the laboratory by witnessing the growth of entanglement between two masses in spatial quantum superpositions. The required superpositions can be created via Stern-Gerlach in...
Solving the Lipkin model using quantum computers with two qubits only with a hybrid quantum-classical technique based on the generator coordinate method
Yann Beaujeault-Taudière, Denis Lacroix·Dec 7, 2023
The possibility of using the generator coordinate method (GCM) using hybrid quantum-classical algorithms with reduced quantum resources is discussed. The task of preparing the basis states and calculating the various kernels involved in the GCM is as...
Photoinduced charge-carrier dynamics in a semiconductor-based ion trap investigated via motion-sensitive qubit transitions
Woojun Lee, Daun Chung, Honggi Jeon +8 more·Nov 29, 2023
Ion trap systems built upon microfabricated chips have emerged as a promising platform for quantum computing to achieve reproducible and scalable structures. However, photo-induced charging of materials in such chips can generate undesired stray elec...
Circuit-noise-resilient virtual distillation
Xiao-Yue Xu, Chen Ding, Shuo Zhang +2 more·Nov 14, 2023
Quantum error mitigation (QEM) is vital for improving quantum algorithms’ accuracy on noisy near-term devices. A typical QEM method, called Virtual Distillation (VD), can suffer from imperfect implementation, potentially leading to worse outcomes tha...