Coherent dynamics of a Josephson charge qubit

Details Coherent dynamics of a Josephson charge qubit Coherent dynamics of a Josephson charge qubit

2003-05-19

arxiv.org/abs/cond-mat/0305433v4

Phys. Rev. B 69, 140503 (2004)

Physics

Condensed Matter

Superconductivity

accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.140503

We have fabricated a Josephson charge qubit by capacitively coupling a single-Cooper-pair box (SCB) to an electrometer based upon a single-electron transistor configured for radio-frequency readout (RF-SET). Charge quantization of 2e is observed and microwave spectroscopy is used to extract the Josephson and charging energies of the box. We perform coherent manipulation of the SCB by using very fast DC pulses and observe quantum oscillations in time of the charge that persist to ~=10ns. The observed contrast of the oscillations is high and agrees with that expected from the finite E_J/E_C ratio and finite rise-time of the DC pulses. In addition, we are able to demonstrate nearly 100% initial charge state polarization. We also present a method to determine the relaxation time T_1 when it is shorter than the measurement time T_{meas}.

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