Patents by Inventor Chetan V. Nayak

Chetan V. Nayak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7598514
    Abstract: A quantum computer can only function stably if it can execute gates with extreme accuracy. “Topological protection” is a road to such accuracies. Quasi-particle interferometry is a tool for constructing topologically protected gates. Assuming the corrections of the Moore-Read Model for ?=5/2's FQHE (Nucl. Phys. B 360, 362 (1991)) we show how to manipulate the collective state of two e/4-charge anti-dots in order to switch said collective state from one carrying trivial SU(2) charge, |1>, to one carrying a fermionic SU(2) charge |?>. This is a NOT gate on the {|1>, |?>} qubit and is effected by braiding of an electrically charged quasi particle ? which carries an additional SU(2)-charge. Read-out is accomplished by ?-particle interferometry.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: October 6, 2009
    Assignee: Microsoft Corporation
    Inventors: Michael H. Freedman, Chetan V. Nayak, Sankar Das Sarma
  • Patent number: 7427771
    Abstract: Experiments suggest that the mathematically weakest non-abelian TQFT may be physically the most robust. Such TQFT's—the v=5/2 FQHE state in particular—have discrete braid group representations, so one cannot build a universal quantum computer from these alone. Time tilted interferometry provides an extension of the computational power (to universal) within the context of topological protection. A known set of universal gates has been realized by topologically protected methods using “time-tilted interferometry” as an adjunct to the more familiar method of braiding quasi-particles. The method is “time-tilted interferometry by quasi-particles.” The system is its use to construct the gates {g1, g2, g3}.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: September 23, 2008
    Assignee: Mircosoft Corporation
    Inventors: Michael H. Freedman, Chetan V. Nayak
  • Publication number: 20080224726
    Abstract: A quantum computer can only function stably if it can execute gates with extreme accuracy. “Topological protection” is a road to such accuracies. Quasi-particle interferometry is a tool for constructing topologically protected gates. Assuming the corrections of the Moore-Read Model for ?=5/2's FQHE (Nucl. Phys. B 360, 362 (1991)) we show how to manipulate the collective state of two e/4-charge anti-dots in order to switch said collective state from one carrying trivial SU(2) charge, |1>, to one carrying a fermionic SU(2) charge |?>. This is a NOT gate on the {|1>, |?>} qubit and is effected by braiding of an electrically charged quasi particle ? which carries an additional SU(2)-charge. Read-out is accomplished by ?-particle interferometry.
    Type: Application
    Filed: May 28, 2008
    Publication date: September 18, 2008
    Applicant: Microsoft Corporation
    Inventors: Michael H. Freedman, Chetan V. Nayak, Sankar Das Sarma
  • Publication number: 20080129328
    Abstract: A quantum computer can only function stably if it can execute gates with extreme accuracy. “Topological protection” is a road to such accuracies. Quasi-particle interferometry is a tool for constructing topologically protected gates. Assuming the corrections of the Moore-Read Model for ?= 5/2's FQHE (Nucl. Phys. B 360, 362 (1991)) we show how to manipulate the collective state of two e/4-charge anti-dots in order to switch said collective state from one carrying trivial SU(2) charge, |1>, to one carrying a fermionic SU(2) charge |?>. This is a NOT gate on the {|1>, |?>} qubit and is effected by braiding of an electrically charged quasi particle ? which carries an additional SU(2)-charge. Read-out is accomplished by ?-particle interferometry.
    Type: Application
    Filed: October 6, 2006
    Publication date: June 5, 2008
    Inventors: Michael H. Freedman, Chetan V. Nayak
  • Patent number: 7321131
    Abstract: Experiments suggest that the mathematically weakest non-abelian TQFT may be physically the most robust. Such TQFT's—the ?=5/2 FQHE state in particular—have discrete braid group representations, so one cannot build a universal quantum computer from these alone. Time tilted interferometry provides an extension of the computational power (to universal) within the context of topological protection. A known set of universal gates has been realized by topologically protected methods using “time-tilted interferometry” as an adjunct to the more familiar method of braiding quasi-particles. The method is “time-tilted interferometry by quasi-particles.” The system is its use to construct the gates {g1, g2, g3}.
    Type: Grant
    Filed: October 7, 2005
    Date of Patent: January 22, 2008
    Assignee: Microsoft Corporation
    Inventors: Michael H. Freedman, Chetan V. Nayak
  • Patent number: 7250624
    Abstract: A quantum computer can only function stably if it can execute gates with extreme accuracy. “Topological protection” is a road to such accuracies. Quasi-particle interferometry is a tool for constructing topologically protected gates. Assuming the corrections of the Moore-Read Model for v= 5/2's FQHE (Nucl. Phys. B 360, 362 (1991)) we show how to manipulate the collective state of two e/4-charge anti-dots in order to switch said collective state from one carrying trivial SU(2) charge, |1>, to one carrying a fermionic SU(2) charge |?>. This is a NOT gate on the {|1>, |?>} qubit and is effected by braiding of an electrically charged quasi particle ? which carries an additional SU(2)-charge. Read-out is accomplished by ?-particle interferometry.
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: July 31, 2007
    Assignee: Microsoft Corporation
    Inventors: Michael H. Freedman, Chetan V. Nayak