Raman coherence in a circuit quantum electrodynamics lambda system
Journal article, 2016
Atomic three-level systems dressed by two coherent electromagnetic fields can exhibit coherent population trapping and electromagnetically induced transparency (EIT) due to quantum interference. By addressing the combined qubit-cavity states of a superconducting transmon qubit in a three-dimensional copper cavity with two microwave drives we establish an effective system, two legs of which are defined by a dipole transition and a two-photon transition. This circuit-based system allows the observation of three-microwave-photon Raman coherence effects, including coherent population trapping and EIT, which are demonstrated here with both steady-state spectroscopic techniques and time-domain measurements. By sending Gaussian microwave pulses through the cavity in the EIT regime, a negative group velocity of the pulse is observed with the peak of the pulse exiting the cavity 9.4 μs before entering.
Author
S. Novikov
Northrop Grumman corporation
University of Maryland
T. Sweeney
University of Maryland
J.E. Robinson
University of Maryland
U.S. Army Research Laboratory
S.P. Premaratne
University of Maryland
Baladitya Suri
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
F.C. Wellstood
University of Maryland
Center for Nanophysics and Advanced Materials
B.S. Palmer
University of Maryland
Nature Physics
1745-2473 (ISSN) 17452481 (eISSN)
Vol. 12 1 75-79Subject Categories
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1038/nphys3537