Extra-substrate control system

Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Tunneling through region of reduced conductivity

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C264S663000, C365S160000

Reexamination Certificate

active

07042005

ABSTRACT:
The present invention involves a quantum computing apparatus that includes a substrate attached to which is a flux shield upon which is at least one element of circuitry. The flux shield has an aperture. Inside the aperture is a superconducting structure. The superconducting structure and the circuitry interact so that a change in a state of the superconducting structure can be detected by the circuitry. The present invention provides a method for initializing and measuring the state of a superconducting structure by adjusting and measuring the current in an element of circuitry coupled to the structure by a flux shield. The present invention provides a mechanism for coupling qubits. In embodiments of the present invention, qubits are selectively coupled by a coupling circuit that can be on a second substrate. The coupling of the qubit to the coupling circuit is enhanced by the presence of a flux shield.

REFERENCES:
patent: 3573759 (1971-04-01), Silver et al.
patent: 5323344 (1994-06-01), Katayama et al.
patent: 5326986 (1994-07-01), Miller et al.
patent: 6317766 (2001-11-01), Grover
patent: 6360112 (2002-03-01), Mizuno et al.
patent: 6495854 (2002-12-01), Newns et al.
patent: 6803599 (2004-10-01), Amin et al.
patent: 2001/0020701 (2001-09-01), Zagoskin
patent: 2003/0111661 (2003-06-01), Tzalenchuk et al.
patent: 195 11 172 (1996-10-01), None
patent: 0916961 (1999-05-01), None
patent: WO 96/12305 (1996-04-01), None
patent: WO 2003/090161 (2003-10-01), None
patent: WO 2003/090161 (2005-02-01), None
U.S. Appl. No. 60/349,663, filed Jan. 15, 2002, Zagoskin et al.
A. Barenco et al., “Elementary Gates for Quantum Computation,”Physical Review A 52:3457-3467 (1995).
A. Barone, T. Hakio{hacek over (g)}lu, and I.O. Kulik, “Quantum Computation with Aharonov-Bohm Qubits,” www.arXiv.org preprint: cond-mat/0203038 v1(Mar. 2, 2002).
S.L. Braunstein and H-K. Lo (eds.),Scalable Quantum Computers, Wiley-VCH Verlag GmbH, Berlin (2001) pp. 273-284; 285-304; 305-324.
D. Deutsch, “Quantum Theory, the Church-Turing Principle and the Universal Quantum Computer,”Proc. of the Roy. Soc. of London A 400:97-117 (1985).
D. DiVincenzo, “The Physical Implementation of Quantum Computation,” published www.ArXiv.org preprint: quant-ph/0002077 (Apr. 13, 2000).
R. P. Feynman, “Simulating Physics with Computers,”Int. J. Theor. Phys. 21:467-488 (1982).
J.R. Friedman, V. Patel, W. Chen, S.K. Tolpygo, and J.E. Lukens, “Quantum superposition of distinct macroscopic states,”Nature, 406:43-46 (2000).
L. Grover, “A Fast Quantum Mechanical Algorithm for Database Search,”Proc. 28th STOC, 212-219 (1996).
E. Il'ichev, V. Zakosarenko, R.P.J. IJsselsteijn, V. Schultze, H.G. Meyer, H.E. Hoenig, H. Hilgenkamp, and J. Mannhart, “Nonsinusoidal current-phase relationship of grain boundary Josephson junctions in high-Tcsuperconductors,”Phys. Rev. Lett. 81:894-897 (1998).
Il'ichev et al., “Radio-frequency Based Monitoring of Small Supercurrents,”Review of Scientific Instruments 72(3):1882-1887, (2001).
E. Il'ichev, M. Grajcar, R. Hlubina, R.P.J. IJsselsteijn, H.E. Hoenig, H.-G. Meyer, A. Golubov, M.H.S. Amin, A.M. Zagoskin, A.N. Omelyanchouk, and M.Yu. Kupriyanov, “Degenerate Ground State in a Mesoscopic YBa2Cu3O7-xGrain Boundary Josephson Junction,”Phys. Rev. Lett.,86:5369-5372 (Mar. 2001).
P. Joyez et al., “Observation of Parity-Induced Suppression of Josephson Tunneling in the Superconducting Single Electron Transistor,”Physical Review Letters, 72(15):2458-2461, (1994) (with reprint of Fig. 1).
M.B. Ketchen, “Integrated Thin-Film dc SQUID Sensors,”IEEE Trans. on Magnetic23(2):1650-1657 (1987).
I.O. Kulik, T. Hakio{hacek over (g)}lu, and A. Barone, “Quantum Computational Gates with Radiation Free Couplings,” www.arXiv.org preprint: cond-mat/0203313 v1 (Mar. 14, 2002).
Y. Makhlin, G. Schön, and A. Shnirman, “Quantum-State Engineering with Josephson-Junction Devices,”Reviews of Modern Physics 73:357-400 (Apr. 2001).
J.E. Mooij, T.P. Orlando, L. Levitov, L. Tian, C.H. van der Wal, and S. Lloyd, “Josephson persistent-current qubit,”Science 285:1036-1039 (1999).
Y. Nakamura, Yu. A. Pashkin, and J.S. Tsai, “Coherent control of macroscopic quantum states in a single-Cooper-pair box,”Nature 398: 786-788 (1999).
T.P. Orlando, J.E. Mooij, L. Tian, C.H. van der Wal, L.S. Levitov, S. Lloyd, and J.J. Mazo, “Superconducting Persistent Current Qubit,”Phys. Rev. B60:15398-15413 (1999).
T.P. Orlando, L. Tian, D.S. Crankshaw, S. Lloyd, C.H. van der Wal, J.E. Mooij, and F. Wilhelm, “Engineering the Quantum Measurement Process For The Persistent Current Qubit,”Physica C 368:294-299 (Mar. 2002).
R. Rifkin and B.S. Deaver, “Current-Phase relation and phase-dependent conductance of superconducting point contacts from rf impedance measurements,”Phys. Rev. B 13:3894-3901 (1976).
V.V. Schmidt,The Physics of Superconductors, P. Müller and A.V. Ustinov (Eds.), Springer, 1997, chapter 4.
A. Shnirman, and G. Schön, “Quantum measurements performed with a single-electron transistor,”Phys. Rev. B 57(24):15400-15407 (1998).
R. Stolz, L. Fritzsch and H.-G. Meyer, “LTS SQUID sensor with a new configuration,”Supercond. Sci. Technol. 12: 806-808 (1999).
H. Tanaka, Y. Sekine, S. Saito and H. Takayanagi, “DC-SQUID Readout Readout For Qubit,”Physica C, 368:300-304 (Mar. 2002).
C.H. van der Wal, A.C.J. ter Haar, F.K. Wilhelm, R.N. Schouten, C.J.P.M. Harmans, T.P. Orlando, S. Lloyd, J.E. Mooij, “Quantum Superposition of Macroscopic Persistent-Current States,”Science, 290:773-777 (2000).
Berggren, K.K., et al., “An Integrated Superconductive Device Technology for Qubit Control,”Proceedings of the 1stInternational Conference on Experimental Implementation of Quantum Computation, front page, copyright page, pp. 121-126 (2001).
Zhang, Y., et al., “Substrate resonator for HTS rf SQUID operation,”Physica C 372-376:282-286 (2002).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Extra-substrate control system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Extra-substrate control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extra-substrate control system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3633276

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.