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
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. 123 23 233602Subject Categories
Subatomic Physics
Atom and Molecular Physics and Optics
Other Physics Topics
DOI
10.1103/PhysRevLett.123.233602
PubMed
31868475