Signatures of Open and Noisy Quantum Systems in Single-Qubit Quantum Annealing

被引：6

作者：

Morrell, Zachary ^{[1
]}

Vuffray, Marc ^{[1
]}

Lokhov, Andrey Y. ^{[1
]}

Bartschi, Andreas ^{[1
]}

Albash, Tameem ^{[2
,3
,4
]}

Coffrin, Carleton ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Univ New Mexico, Dept Elect & Comp Engn, Albuquerque, NM 87131 USA

[3] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

[4] Univ New Mexico, Ctr Quantum Informat & Control CQuIC, Albuquerque, NM 87131 USA

来源：

PHYSICAL REVIEW APPLIED | 2023年 / 19卷 / 03期

基金：

美国国家科学基金会;

关键词：

Magnetic fields - Quantum optics - Qubits;

D O I：

10.1103/PhysRevApplied.19.034053

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We propose a quantum annealing protocol that effectively probes the dynamics of a single qubit on D-Wave's quantum annealing hardware. This protocol uses D-Wave's h-gain schedule functionality, which allows the rapid suppression of the longitudinal magnetic field at arbitrary points during the anneal. This feature enables us to distinguish between open and closed-system dynamics as well as the presence and absence of longitudinal magnetic field noise. We show that thermal fluctuations alone are not sufficient to explain the system's dynamics and that a prominent role is played by magnetic field fluctuations, which need to be included in an open quantum system description. Moreover, our protocol only requires single-qubit measurements, which makes it suitable as an exploration and calibration tool for large-scale quantum annealing hardware.

引用

页数：10

共 58 条

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