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Sisyphus damping and amplification by a superconducting qubit | | M. Grajcar
; S.H.W. van der Ploeg
; A. Izmalkov
; E. Il'ichev
; H.-G. Meyer
; A. Fedorov
; A. Shnirman
; Gerd Schoen
; | | Date: |
6 Aug 2007 | | Abstract: | Furthering the analogies between superconducting and quantum optical systems
we demonstrate Sisyphus damping, which is the key element of the Sisyphus
cooling protocol, as well as its exact opposite, Sisyphus amplification. For
this purpose the qubit is coupled to a low-frequency LC circuit and driven
near-resonantly by a high-frequency external field. The combination of
red-detuned driving of the coupled system with spontaneous emission processes,
creates a situation where in the complete oscillation cycle of the LC circuit
energy is transferred from the LC circuit to the qubit, similar to Sisyphus who
always had to roll a stone uphill. The qubit, in turn, transfers the energy
into the environment. For blue-detuning the same mechanism creates excitations
in the LC circuit with a tendency towards lasing and the characteristic
line-width narrowing. In this regime ``lucky Sisyphus’’ always rolls the stone
downhill. Parallel to the experimental demonstration we analyze the system
theoretically and find quantitative agreement, which allows us to estimate the
system parameters. | | Source: | arXiv, 0708.0665 | | Services: | Forum | Review | PDF | Favorites | |
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