Coherent dynamics of a Josephson charge qubit

By T. Duty, David Gunnarsson, K. Bladh, Per Delsing. 2003

137 citations recorded by the source corpus.

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 (SET) 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 ≃10 ns. The observed contrast of the oscillations is high and agrees with that expected from the finite EJ/EC 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 T1 when it is shorter than the measurement time

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/3ca6362d24a45106d2daba38e33852fdecc9842c

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In Artificial Intelligence

1. Elisabetta Paladino
2. Giuseppe Falci
3. Y. Galperin
4. Boris L. Altshuler

In Atomic and Molecular Physics, and Optics

1. Elisabetta Paladino
2. Giuseppe Falci
3. Y. Galperin
4. Boris L. Altshuler

Citations in the corpus

• 1 / f noise: Implications for solid-state quantum information (2013, background): “More often, resonances are signatures of the presence of spurious fluctuators which also show up in the time resolved evolution, unambiguously proving the discrete nature of these noise sources (Duty et al., 2004).”