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Coherent dynamics of a Josephson charge qubit
Open accessAbstract
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 $\ensuremath{\simeq}10\mathrm{ns}.$ 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 ${T}_{\mathrm{meas}}.$
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Cited by
Charge-insensitive qubit design derived from the Cooper pair box
Koch, J., Yu, T. M., Gambetta, J., Houck, A. A., Schuster, D. I., Majer, J., Blais, A., Devoret, M. H., Girvin, S. M., & Schoelkopf, R. J. (2007) · Physical Review A · doi:10.1103/physreva.76.042319 · Cited by 3,351
Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
Wallraff, A., Schuster, D. I., Blais, A., Frunzio, L., Majer, J., Devoret, M. H., Girvin, S. M., & Schoelkopf, R. J. (2005) · Physical Review Letters · doi:10.1103/physrevlett.95.060501 · Cited by 573
Quantum Noise in the Josephson Charge Qubit
Astafiev, O., Pashkin, Y., Nakamura, Y., Yamamoto, T., & Tsai, J. (2004) · Physical Review Letters · doi:10.1103/physrevlett.93.267007 · Cited by 288
Metadata
- Authors
- Duty, T., Gunnarsson, D., Bladh, K., & Delsing, P.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2004-04-05
- Volume
- 69
- Issue
- 14
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W2025574324
- Cited by
- 178
- References
- 0
- FWCI
- 17.00
- Type
- journal article
- Language
- en
- Open access
- green
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- Duty, T., Gunnarsson, D., Bladh, K., & Delsing, P. (2004). Coherent dynamics of a Josephson charge qubit. Physical Review B. https://doi.org/10.1103/physrevb.69.140503
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