Ralph Godwin Devoe

US Patent:

57930910, Aug 11, 1998

Filed:

Dec 13, 1996

Appl. No.:

8/768019

Inventors:

Ralph Godwin Devoe - Palo Alto CA

Assignee:

International Business Machines Corporation

International Classification:

H01L 3100
H01L 29205

US Classification:

257432

Abstract:

A parallel architecture of quantum logic gates and quantum communication channels is provided for a quantum computer, thereby achieving advantageous efficiency and computation speed. The architecture of the invention enables parallel memory operations on large quantum words, and permits the application, to the quantum case, of parallel algorithms for mathematical operations such as addition and multiplication. The invention also includes a novel apparatus for realizing parallel architecture using an array of miniature elliptical ion traps, with as many traps as there are bits in a quantum word. The ion trap array preferably uses an elliptical planar geometry, which can microfabricated by photolithography. Quantum information is transferred from one ion trap to another by either an optical coupling via a high finesse resonant cavity (photon coupling) or by electrostatic coupling of the ions' mechanical motion (phonon coupling).

US Patent:

52488837, Sep 28, 1993

Filed:

May 12, 1992

Appl. No.:

7/883798

Inventors:

Richard G. Brewer - Palo Alto CA
Ralph G. Devoe - Palo Alto CA
Kenneth L. Foster - Los Gatos CA
John A. Hoffnagle - Morgan Hill CA
Reinald Kallenbach - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01J 4926

US Classification:

250292

Abstract:

An ion confinement, i. e. , trap, apparatus comprises electrically conductive members, including concentric, coplanar rings or parallel sheets separated by dielectric spacers disposed on the outer edges of the sheets, each of the sheets having a circular hole, the circular holes being symmetrically aligned substantially along a common axis. The trap apparatus further has means for applying an RF potential to the conductive members, such that the resulting electric field being generated in the space defined by the conductive members has a characteristic of a substantially quadrupole field. A charged particle, being injected into the space, is confined in the field, maintaining a dynamic equilibrium condition.

US Patent:

62186574, Apr 17, 2001

Filed:

Oct 15, 1998

Appl. No.:

9/172759

Inventors:

Donald S. Bethune - San Jose CA
Ralph G. Devoe - Palo Alto CA
Christian Kurtsiefer - San Jose CA
Charles T. Rettner - San Jose CA
William P. Risk - Sunnyvale CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01J 4014

US Classification:

250214R

Abstract:

An avalanche-type detector circuit includes an avalanche-type photon detector device, a coupling capacitor, a bias network, a first transmission line and a second transmission line. The coupling capacitor has a first terminal that is coupled to a first terminal of the avalanche-type photon detector device. A first terminal of the bias network is coupled to the first terminal of the avalanche-type photon detector device, while a second terminal of the bias network is coupled to a bias voltage so that the avalanche-type photon detector device is reverse biased. A first end of the first transmission line is coupled to a second terminal of the coupling capacitor, and second end of the first transmission line is terminated by an open-circuit termination. A first end of the second transmission line is coupled to a second terminal of the avalanche-type photon detector device. The second end of the second transmission line is terminated by a short-circuit termination.

US Patent:

53790006, Jan 3, 1995

Filed:

Oct 30, 1992

Appl. No.:

/081505

Inventors:

Richard G. Brewer - Palo Alto CA
Ralph G. Devoe - Palo Alto CA
Kenneth L. Foster - Los Gatos CA
John A. Hoffnagle - Morgan Hill CA
Reinald Kallenbach - Bern, CH

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03L 726

US Classification:

331 3

Abstract:

An atomic clock system employs one of a family of ion trap configurations confining an ion in a potential well, such that a vibrational frequency confined ion may be measured accurately. The ion traps disclassed for use in such atomic clock systems include configurations of ring-shaped conductive members, or sheets of conductive material having circular holes therein. The trap apparatus further has a means to apply an RF field such that the resulting electric field being generated in a space defined by the conductive members has a characteristic of a substantially quadrupole field whereby a charged particle, being injected into the space, is confined in said field, maintaining a dynamic equilibrium condition.