Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Tunneling through region of reduced conductivity
Reexamination Certificate
2005-07-19
2005-07-19
Flynn, Nathan J. (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Thin active physical layer which is
Tunneling through region of reduced conductivity
C257S009000, C257S034000, C257S032000, C257S033000, C257S200000, C257S663000
Reexamination Certificate
active
06919579
ABSTRACT:
A solid-state quantum computing qubit includes a multi-terminal junction coupled to a superconducting loop where the superconducting loop introduces a phase shift to the superconducting order parameter. The ground state of the supercurrent in the superconducting loop and multi-terminal junction is doubly degenerate, with two supercurrent ground states having distinct magnetic moments. These quantum states of the supercurrents in the superconducting loop create qubits for quantum computing. The quantum states can be initialized by applying transport currents to the external leads. Arbitrary single qubit operations may be performed by varying the transport current and/or an externally applied magnetic field. Read-out may be performed using direct measurement of the magnetic moment of the qubit state, or alternatively, radio-frequency single electron transistor electrometers can be used as read-out devices when determining a result of the quantum computing. Further, qubits as described above can form arrays of qubits for performing controlled quantum computing calculations. In one example, an array of qubits can be utilized as a random number generator.
REFERENCES:
patent: 5153171 (1992-10-01), Smith et al.
patent: 5917322 (1999-06-01), Gershenfeld et al.
patent: 6459097 (2002-10-01), Zagoskin
patent: 6495854 (2002-12-01), Newns
patent: 6504172 (2003-01-01), Zagoskin et al.
patent: 6690162 (2004-02-01), Schopohl et al.
patent: 2002/0117738 (2002-08-01), Amin et al.
patent: 2002/0121636 (2002-09-01), Amin et al.
patent: 2003/0027724 (2003-02-01), Rose et al.
patent: 2003/0098455 (2003-05-01), Amin et al.
patent: WO 02/086813 (2002-10-01), None
IDS Ref BF, de Bruyn Ouboter et al.
IDS Ref A05, Makhlin et al.
B.J. Vleeming, F.J.C. van Bemmelen, M.R. Berends, R. de Bruyn Ouboter, and A.N. Omelyanchouk, “Measurements of the flux, embraced by the ring of a four-terminal SQUID, as a function of the external magnetic flux and the applied transport current”,Physica B,vol. 262, pp. 296-305 (1999).
Alexandre Blain and Alexandre M. Zagoskin, “Operation of Universal Gates in a Solid-State Quantum Computer Based on Clean Josephson Junctions Between D-Wave Superconductors”,Physical Review A,vol. 61, pp. 042308-1-042308-4, 2000.
Pieter Jonker ahd Jie Han, “On Quantum & Classical Computing with Arrays of Superconducting Persistent Current Qubits”,Proceedings Fifth IEEE International Workshop on Computer Architectures for Machine Perception,Padova Italy, pp. 69-78, Sep. 11-13, 2000.
G. Blatter, V.B. Geshkenbein, A.L. Fauchère, M.V. Feigel'man, and L.B. Ioffe., “Quantum Computing with Superconducting Phase Qubits”, Physica C, vol. 352, pp. 105-109.
Yuriy Makhlin, Gerd Schön, and Alexander Shnirman, “Nano-Electronic Circuits as Quantum.Bits”,IEEE International Symposium on Circuits and Systems,May 28-31, 2000, Geneva Switzerland, pp. II-241-II-244.
Blatter, G. et al., “Design aspects of superconducting-phase quantum bits”,The American Physical Society(2001) vol. 63, pp. 174511-1 to 174511-9.
Briegel, H.-J. et al., “Quantum repeaters for communication” (1998), pp. 1-8.
Bruder, C. et al., “Tunnel junctions of unconventional superconductors”,The American Physical Society(1995) vol. 51, pp. 904-907.
Chrestin, A. et al., “Evidence for a proximity-induced energy gap in Nb/INAs/Nb junctions”,The American Physical Society(1997) vol. 55, pp. 8457-8465.
Dana, A. et al., “Electrostatic force spectroscopy of a single InAs quantum dot” (2001), pp. 1-5.
Feynman, R., “Simulating Physics with Computers”,International Journal of Theoretical Physics(1982) vol. 21, pp. 467-488.
Grover, L., “A fast quantum mechanical algorithm for database search”, pp. 1-8.
Havel, T. et al., “Principles and demonstrations of quantum information processing by NMR spectroscopy” (1999), pp. 1-42.
Jacobs, A. et al., “Proximity Effect, Andreev Reflections, and Charge Transport in Mesoscopic Superconducting-Semiconducting Heterostructures” (1998) eight pages.
Jones, J. et al., “Implementation of a quantum search algorithm on a quantum computer”,Nature(1998) vol. 393, pp. 344-346.
Joyez, P. et al., “Observation of Parity-Induced Suppression of Jospehson Tunneling in the Superconducting Single Electron Transistor”,The American Physical Society(1994) vol. 72, pp. 2458-2461.
Kitaev, A., “Quantum measurements and the Abelian Stabilizer Problem” (1995) pp. 1-22.
Knill, E. et al., “Resilient Quantum Computation”,Science(1998) vol. 279, pp. 342-345.
Korotkov, A. et al., “Charge sensitivity of radio frequency single-electron transistor”,American Institute of Physics(1999) vol. 74, pp. 4052-4054.
Lachenmann, S. et al., “Charge transport in superconductor/semiconductor
ormal-conductor step junctions”,The American Physical Society(1997) vol. 56, pp. 108-115.
Mooij, J. et al., “Josephson Persistent-Current Qubit”,Science(1999) vol. 285, pp. 1036-1039.
Nakamura, Y. et al., “Coherent control of macroscopic quantum states in a single-Cooper-pair box”,Nature(1999), vol. 398, pp. 786-788.
Omelyanchouk, A. et al., “Ballistic Four-Terminal Josephson Junction: Bistable States and Magnetic Flux Transfer” (1999) pp. 1-11 with six pages of drawings.
Ouboter, R. et al., “Macroscopic quantum interference effects in superconducting multiterminal microstructures”,Academic Press(1999) vol. 25, pp. 1005-1017.
Ryazanov, V. et al., “Coupling of Two superconductors through a ferromagnet: evidence for a η junction”(2000) pp. 1-6.
Schoelkopf, R. et al., “The Radio-Frequency Single-Electron Transistor (RF-SET): A Fast and Ultrasensitive Electrometer”,Science(1998), vol. 280, pp. 1238-1242.
Schulz, R. et al., “Design and realization of an all d-wave dc η-superconducting quantum interference device”,American Institute of Physics(2000), vol. 76, pp. 912-914.
Shor, P., “Introduction to Quantum Algorithms” (2000) pp. 1-23.
Shor, P., “Polynomial-Time Algorithms For Prime Factorization and Discrete Logarithms On A Quantum Computer”, pp. 1-26.
Shor, P., “Polynomial-Time Algorithms For Prime Factorization And Discrete Logarithms On A Quantum Computer”,Society for Industrial and Applied Mathematics(1997) vol. 26, pp. 1484-1509.
Tafuri, F. et al., “Feasibility of biepitaxial YBa2Cu3O7-xJosephson junctions for fundamental studies and potential circuit implementation”,The American Physical Society(2000) vol. 62, pp. 431-438.
Vandersypen, L. et al., “Experimental Realization of an Order-Finding Algorithm with an NMR Quantum Computer”,The American Physical Society(2000) vol. 25, pp. 5452-5455.
Vleeming, B., “The Four-terminal SQUID”, pp. 1-100.
Volkov, A. et al., “Phase-coherent effects in multiterminal superconductor
ormal metal mesoscopic structures” (2000), pp. 1-6.
Ye, P. et al., “High Magnetic Field Microwave Conductivity of 2D Electrons in an Array of Antidots” (2001), pp. 1-4.
R. de Bruyn Ouboter, A.N. Omelyanchouk, and E.D. Vol, “Multi-terminal SQUID controlled by the transport current”,PhysicaB, vol. 205, pp. 153-162 (1995).
R. de Bruyn Ouboter and A.N. Omelyanchouk, “Four-terminal SQUID: Magnetic Flux Switching in Bistable State and Noise”,PhysicaB, vol. 254, pp. 134-140 (1998).
R. de Bruyn Ouboter, A.N. Omelyanchouk, and E.D. Vol, “Dynamical properties of the Josephson multiterminals in an applied magnetic field”,PhysicaB, vol. 239, pp. 203-215 (1997).
R.de Bruyn Ouboter, A.N. Omelyanchouk, and E.D. Vol. “Magnetic flux locking in two weakly coupled superconducting rings”, ArXiv.org: cond-mat/9805174, pp. 1-10 (1998), website last accessed on Jan. 16, 2002.
Gianni Blatter, Vadim B. Geshkenbein, and Lev B. Ioffe,
Amin Mohammad H. S.
Blais Alexandre
Duty Timothy
Omelyanchouk Alexander
Rose Geordie
D-Wave Systems Inc.
Flynn Nathan J.
Jones Day
Lovejoy Brett
Wilson Scott R
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