Coherent Coupled Qubits for Quantum Annealing
Name
PhysRevApplied.8.014004.pdf
Size
1.02 MB
Format
Adobe PDF
Checksum (MD5)
98827fc622acaa7330846311de6cb9b1
Author(s)
Weber, Steven J.
Samach, Gabriel O.
Hover, David J.
Gustavsson, Simon
Kim, David K.
Melville, Alexander J.
Rosenberg, Danna
Sears, Adam P.
Yan, Fei
Yoder, Jonilyn Longenecker
Date Issued
July 2017
Journal
Physical Review Applied
Publisher
American Physical Society
Citation
Weber, Steven J. et al. “Coherent Coupled Qubits for Quantum Annealing.” Physical Review Applied 8.1 (2017): n. pag. © 2017 American Physical Society
Version
Final published version
Abstract
Quantum annealing is an optimization technique which potentially leverages quantum tunneling to enhance computational performance. Existing quantum annealers use superconducting flux qubits with short coherence times limited primarily by the use of large persistent currents I[subscript p]. Here, we examine an alternative approach using qubits with smaller I[subscript p] and longer coherence times. We demonstrate tunable coupling, a basic building block for quantum annealing, between two flux qubits with small (approximately 50-nA) persistent currents. Furthermore, we characterize qubit coherence as a function of coupler setting and investigate the effect of flux noise in the coupler loop on qubit coherence. Our results provide insight into the available design space for next-generation quantum annealers with improved coherence.
MIT Department
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevApplied.8.014004
