Superconducting qubit with a plurality of capacitive couplings

Electronic digital logic circuitry – Superconductor – Tunneling device

Reexamination Certificate

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C327S186000, C327S367000, C327S528000, C365S162000

Reexamination Certificate

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11267478

ABSTRACT:
A first qubit having a superconducting loop interrupted by a plurality of Josephson junctions is provided. Each junction interrupts a different portion of the superconducting loop and each different adjacent pair of junctions in the plurality of Josephson junctions defines a different island. An ancillary device is coupled to the first qubit. In a first example, the ancillary device is a readout mechanism respectively capacitively coupled to a first and second island in the plurality of islands of the first qubit by a first and second capacitance. Quantum nondemolition measurement of the first qubit's state may be performed. In a second example, the ancillary device is a second qubit. The second qubit's first and second islands are respectively capacitively coupled to the first and second islands of the first qubit by a capacitance. In this second example, the coupling is diagonal in the physical basis of the qubits.

REFERENCES:
patent: 4370359 (1983-01-01), Fetter et al.
patent: 6670630 (2003-12-01), Blais et al.
patent: 6838694 (2005-01-01), Esteve et al.
patent: 6900454 (2005-05-01), Blais et al.
patent: 6930318 (2005-08-01), Vion et al.
patent: 6930320 (2005-08-01), Blais et al.
patent: 2005/0082519 (2005-04-01), Amin et al.
Amin, M.H.S., 2003, “Charge-Phase Qubit in Phase Regime,” arXiv.org:cond-mat/0311220.
Averin, D.V., 2002, “Quantum nondemolition measurements of a qubit,” arXiv.org:cond-mat/0202082.
Berkley, A.J., 2003, “A Josephson Junction Qubit,” Thesis, University of Maryland at College Park, pp. 76-87.
Blatter, G., V.B. Geshkenbein, L.B. Ioffe, 2001, “Design aspects of superconducting-phase quantum bits,” Phys. Rev. B 63, 174511.
Born, D., T. Wagner, W. Krech, U. Hübner, L. Fritzsch, 2001, “Fabrication of Ultrasmall Tunnel Junctions by Electron Beam Direct-Writing,” IEEE Trans. Appl. Supercond. 11, 373.
Braginsky, V.B., F.Y. Khalili, 1996, “Quantum nondemolition measurements: the route from toys to tools,” Rev. Mod. Phys. 68, pp. 1-11.
Caves, C.M., K.S. Thorne, R.W.P. Drever, V.D. Sandberg, M. Zimmermann, 1980, “On the measurement of a weak classical force coupled to a quantum-mechanical oscillator. I. Issues of principle,” Rev. Mod. Phys. 52, pp. 341-392.
Devoret, M.H., R.J. Schoelkopf, 2000, “Amplifying quantum signals with the single-electron transistor,” Nature 406, pp. 1039-1046.
Deutsch, D., 1985, “Quantum theory, the Church-Turing principle and the university quantum computer,” Proc. Roy. Soc. Lond. A 400, p. 97.
Dolan, G.J., 1977, “Offset masks for lift-off photoprocessing,” Appl. Phys. Lett. 31, pp. 337-339.
Duty, T., D. Gunnarsson, K. Bladh, P. Delsing, 2004, “Coherent dynamics of a Josephson charge qubit,” Phys. Rev. B 69, 140503.
Feynmann, R.P., 1982, “Simulating Physics with Computers,” Int. Journ. Theor. Phys. 21, pp. 467-488.
Friedman, J.R., V. Patel, W. Chen, S.K. Tolpygo, J.E. Lukens, 2000, “Quantum superposition of distinct macroscopic states,” Nature 406, pp. 43-46.
Fulton, T.A., G.J. Dolan, 1987, “Observation of Single-Electron Charging Effects in Small Tunnel Junctions,” Phys. Rev. Lett. 59, pp. 109-112.
Grangier, P., J.A. Levenson, J.P. Poizat, 1998, “Quantum non-demolition measurements in optics,” Nature 396, pp. 537-542.
Guillaume, A., J.F. Schneiderman, P. Delsing, H.M. Bozler, P.M. Echternach, 2004, “Free evolution of superposition states in a single Cooper pair box,” Phys. Rev. B 69, 132504.
Il'ichev, E., N. Oukhanski, A. Izmalkov, T. Wagner, M. Grajcar, H.-G. Meyer, A.Y. Smirnov, A. Maassen van den Brink, M.H.S. Amin, A.M. Zagoskin, 2003, “Continuous Monitoring of Rabi Oscillations in a Josephson Flux Qubit,” Phys. Rev. Lett. 91, 097906.
Jordan, A.N., M. Büttiker, 2004, “Quantum Nondemolition Measurement of a Kicked Qubit,” arXiv.org:cond-mat/0406529.
Korotkov, A.N., D.V. Averin, 2001, “Continuous weak measurement of quantum coherent oscillations,” Phys. Rev. B 64, 165310.
Koval, Y., A. Wallraff, M. Fistul, N. Thyssen, H. Kohlstedt, A.V. Ustinov, 1999, “Narrow Long Josephson Junctions,” IEEE Trans. Appl. Supercond. 9, 3957.
Majer, J.B., 2002, “Superconducting Quantum Circuits,” Thesis, Delft University of Technology, pp. 12-13.
Makhlin, Y., G. Schön, A. Shnirman, 2001, “Quantum-state engineering with Josephson-junction devices,” Rev. Mod. Phys. 73, pp. 357-400.
Mooij, J.E., T.P. Orlando, L. Levitov, L. Tian, C.H. van der Wal, S. Lloyd, 1999, “Josephson Persistent-Current Qubit,” Science 285, pp. 1036-1039.
Nakamura, Y., Y.A. Pashkin, J.S. Tsai, 1999, “Coherent control of macroscopic quantum states in a single-Cooper-pair box,” Nature 398, pp. 786-788.
Orlando, T.P., J.E. Mooij, L. Tian, C.H. van der Wal, L.S. Levitov, S. Lloyd, J.J. Mazo, 1999, “Superconducting persistent-current qubit,” Phys. Rev. B 60, 15398.
Paauw, F.G., 2002, “Spectroscopy experiments on two coupled Josephson persistent current qubits,” Thesis, Delft University of Technology, pp. 34-36, 58-60.
Peil, S., G. Gabrielse, 1999, “Observing the Quantum Limit of an Electron Cyclotron: QND Measurements of Quantum Jumps between Fock States,” Phys. Rev. Lett. 83, pp. 1287-1290.
Pryde, G.J., J.L. O'Brien, A.G. White, S.D. Bartlett, T.C. Ralph, 2004, “Measuring a Photonic Qubit without Destroying It,” Phys. Rev. Lett. 92, 190402.
Schoelkopf, R.J., P. Wahlgren, A.A. Kozhevnikov, P. Delsing, D.E. Prober, 1998, “The Radio-Frequency Single-Electron Transistor (RF-SET): A Fast and Ultrasensitive Electrometer,” Science 280, pp. 1238-1242.
Travaglione, B.C., G.J. Milburn, T.C. Ralph, 2002, “Phase estimation as a quantum nondemolition measurement,” arXiv.org:quant-ph/0203130.
Vion, D., A. Aassime, A. Cottet, P. Joyez, H. Pothier, C. Urbina, D. Esteve, M.H. Devoret, 2002, “Manipulating the Quantum State of an Electrical Circuit,” Science 296, pp. 886-889.
Inokuchi, T. et al., “Analog Computation using Quantum-Flux Parametron Devices,” Physica C, 357-360, pp. 1618-1621, Department of Electrical Engineering, Hokkaido University, Kita 13, Nishi 8, Sapporo 060-8628 Japan, Jan. 12, 2001.
Amin, M.H.S., 2003, “Charge-Phase Qubit in Phase Regime,” arXiv.org:cond-mat/0311220.
Averin, D.V., 2002, “Quantum nondemolition measurements of a qubit,” arXiv.org:cond-mat/0202082.
Berkley, A.J., 2003, “A Josephson Junction Qubit,” Thesis, University of Maryland at College Park, pp. 76-87.
Blatter, G., V.B. Geshkenbein, L.B. loffe, 2001, “Design aspects of superconducting-phase quantum bits,” Phys. Rev. B63, 174511.
Born, D., T. Wagner, W. Krech, U. Hübner, L. Fritzsch, 2001, “Fabrication of Ultrasmall Tunnel Junctions by Electron Beam Direct-Wiring,” IEEE Trans. Appl. Supercond. 11,373.
Braginsky, V.B., F.Y. Khalili, 1996, “Quantum nondemolition measurements: the route from toys to tools,” Rev. Mod. Phys.68, pp. 1-11.
Caves, C.M., K.S. Thorne, R.W.P. Drever, V.D. Sandberg, M. Zimmermann, 1980, “On the measurement of a weak classical force coupled to a quantum-mechanical oscillator. I. Issues of principle,” Rev. Mod. Phys.52, pp. 341-392.
Devoret, M.H., R.J. Schoelkopf, 2000, “Amplifying quantum signals with the single-electron transistor,” Nature406, pp. 1039-1046.
Deutsch, D., 1985, “Quantum theory, the Church-Turing principle and the universal quantum computer,” Proc. Roy. Soc. Lond. A400, p. 97.
Dolan, G.J., 1977, “Offset masks for lift-off photoprocessing,” Appl. Phys. Lett.31, pp. 337-339.
Duty, T., D. Gunnarsson, K. Bladh, P. Delsing, 2004, “coherent dynamics of a Josephson charge qubit,” Phys. Rev. B69, 140503.
Feynmann, R.P., 1982, “Simulating Physics with Computers,” Int.

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