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Raman coherence in a circuit quantum electrodynamics lambda system

S. Novikov ; T. Sweeney ; J.E. Robinson ; S.P. Premaratne ; Baladitya Suri (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; F.C. Wellstood ; B.S. Palmer
Nature Physics (1745-2473). Vol. 12 (2016), 1, p. 75-79.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2016-05-11.
CPL Pubid: 236254

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik

Ämnesområden

Fysik

Chalmers infrastruktur