Amplifying Quantum Signals with the Josephson Bifurcation Amplifier (JBA) IRFAN SIDDIQI R. Vijay, E. Boaknin, M. Metcalfe, F. Pierre, C.M. Wilson, C. Rigetti, L. Frunzio, and M. H. Devoret Department of Applied Physics Yale University Acknowledgements: D. Prober, M. Dykman, D. Vion, D. Esteve, R.J. Schoelkopf, & S. Girvin
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Amplifying Quantum Signals with the Josephson Bifurcation Amplifier (JBA)
IRFAN SIDDIQIR. Vijay, E. Boaknin, M. Metcalfe, F. Pierre, C.M.
Wilson, C. Rigetti, L. Frunzio, and M. H. Devoret
Department of Applied PhysicsYale University
Acknowledgements: D. Prober, M. Dykman, D. Vion, D. Esteve, R.J. Schoelkopf, & S. Girvin
THE READOUT PROBLEM FOR SQUBITSDevoret & Schoelkopf (2000)
QUBITREADOUT
OFF0 1
10α β+ ON
0
1 1quantum information classical information
0
WANT:• Readout ON: T1 / τmeas >> 1• Readout OFF: T1, Tϕ not reduced• Short duty cycle• No energy dissipated on chip
(sensitivity, low backaction)
(good switch, low backaction)
(speed to fight drifts)
(no noise to junction)
ARTIFICIAL ATOM : SPLIT COOPER PAIR BOX
( )02ˆ 1( ) cos 1 12 2/
C jn
gH E n n n E nN n n n⎡ ⎤⎛ ⎞= − − + − +⎜ ⎟⎢ ⎥⎝ ⎠⎣ ⎦