Large Collective Lamb Shift of Two Distant Superconducting Artificial Atoms
Journal article, 2019

Virtual photons can mediate interaction between atoms, resulting in an energy shift known as a collective Lamb shift. Observing the collective Lamb shift is challenging, since it can be obscured by radiative decay and direct atom-atom interactions. Here, we place two superconducting qubits in a transmission line terminated by a mirror, which suppresses decay. We measure a collective Lamb shift reaching 0.8% of the qubit transition frequency and twice the transition linewidth. We also show that the qubits can interact via the transmission line even if one of them does not decay into it.

Author

P. Y. Wen

National Tsing Hua University

K. -T. Lin

National Taiwan University

Anton Frisk Kockum

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

B. Suri

Indian Institute of Science

H. Ian

University of Macau

J. C. Chen

National Tsing Hua University

S. Y. Mao

National Chiao Tung University Taiwan

C. C. Chiu

National Tsing Hua University

Per Delsing

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

F. Nori

University of Michigan

RIKEN

G. -D. Lin

National Taiwan University

I. -C. Hoi

National Tsing Hua University

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 122 23 233602

Subject Categories

Subatomic Physics

Atom and Molecular Physics and Optics

Other Physics Topics

DOI

10.1103/PhysRevLett.123.233602

PubMed

31868475

More information

Latest update

1/16/2020