Decoherence-Induced Exceptional Points in a Dissipative Superconducting Qubit

Date
2022-03-17
Language
American English
Embargo Lift Date
Committee Members
Degree
Degree Year
Department
Grantor
Journal Title
Journal ISSN
Volume Title
Found At
APS
Abstract

Open quantum systems interacting with an environment exhibit dynamics described by the combination of dissipation and coherent Hamiltonian evolution. Taken together, these effects are captured by a Liouvillian superoperator. The degeneracies of the (generically non-Hermitian) Liouvillian are exceptional points, which are associated with critical dynamics as the system approaches steady state. We use a superconducting transmon circuit coupled to an engineered environment to observe two different types of Liouvillian exceptional points that arise either from the interplay of energy loss and decoherence or purely due to decoherence. By dynamically tuning the Liouvillian superoperators in real time we observe a non-Hermiticity-induced chiral state transfer. Our study motivates a new look at open quantum system dynamics from the vantage of Liouvillian exceptional points, enabling applications of non-Hermitian dynamics in the understanding and control of open quantum systems.

Description
item.page.description.tableofcontents
item.page.relation.haspart
Cite As
Chen, W., Abbasi, M., Ha, B., Erdamar, S., Joglekar, Y. N., & Murch, K. W. (2022). Decoherence-Induced Exceptional Points in a Dissipative Superconducting Qubit. Physical Review Letters, 128(11), 110402. https://doi.org/10.1103/PhysRevLett.128.110402
ISSN
Publisher
Series/Report
Sponsorship
Major
Extent
Identifier
Relation
Journal
Physical Review Letters
Rights
Publisher Policy
Source
Publisher
Alternative Title
Type
Article
Number
Volume
Conference Dates
Conference Host
Conference Location
Conference Name
Conference Panel
Conference Secretariat Location
Version
Final published version
Full Text Available at
This item is under embargo {{howLong}}