Christopher T Monroe

US Patent:

20200219001, Jul 9, 2020

Filed:

Dec 9, 2019

Appl. No.:

16/708025

Inventors:

- College Park MD, US
Yunseong NAM - North Bethesda MD, US
Christopher MONROE - Ellicott City MD, US

International Classification:

G06N 10/00
H03K 19/14
H03K 19/20

Abstract:

The disclosure describes various aspects of a practical implementation of multi-qubit gate architecture. A method is described that includes enabling ions in the ion trap having three energy levels, enabling a low-heating rate motional mode (e.g., zig-zag mode) at a ground state of motion with the ions in the ion trap; and performing a Cirac and Zoller (CZ) protocol using the low-heating rate motional mode as a motional state of the CZ protocol and one of the energy levels as an auxiliary state of the CZ protocol, where performing the CZ protocol includes implementing the multi-qubit gate. The method also includes performing one or more algorithms using the multi-qubit gate, including Grover's algorithm, Shor's factoring algorithm, quantum approximation optimization algorithm (QAOA), error correction algorithms, and quantum and Hamiltonian simulations. A corresponding system that supports the implementation of a multi-qubit gate architecture is also described.

US Patent:

20200201933, Jun 25, 2020

Filed:

Nov 8, 2019

Appl. No.:

16/677922

Inventors:

- Gaithersburg MD, US
Kevin Chengming Qian - Rockville MD, US
Zachary David Eldredge - Washington DC, US
Wenchao Ge - College Station TX, US
Guido Pagano - Washington DC, US
Christopher Roy Monroe - Ellicott City MD, US

International Classification:

G06F 17/17
G06N 10/00
G01N 24/00

Abstract:

A Heisenberg scaler reduces noise in quantum metrology and includes: a stimulus source that provides physical stimuli; a physical system including quantum sensors that receive a first and second physical stimuli; produces a measured action parameter; receives an perturbation pulse; and produces modal amplitude; an estimation machine that: receives the measured action parameter and produces a zeroth-order value from the measured action parameter; a gradient analyzer that: receives the measured action parameter and produces the measured action parameter and a gradient; the sensor interrogation unit that; receives the modal amplitude; receives the gradient and the measured action parameter produces the perturbation pulse; and produces a first-order value from the modal amplitude, the gradient, and the measured action parameter; a Heisenberg determination machine that: receives the zeroth-order value; receives the first-order value; and produces a physical scalar from the zeroth-order value and the first-order value.

US Patent:

20200082291, Mar 12, 2020

Filed:

Jul 17, 2019

Appl. No.:

16/514099

Inventors:

- College Park MD, US
Christopher R. MONROE - Columbia MD, US
Caroline FIGGATT - Denver CO, US

International Classification:

G06N 10/00
G02F 1/11

Abstract:

Aspects of the present disclosure describe techniques for controlling quantum states of ions in an ion chain for a quantum operation. For example, a method is described that includes providing, from a first direction, a global optical beam to the ions in the ion chain, and providing, from a second direction different from the first direction, to each ion in a subset of the ions in the ion chain, a respective addressing optical beam. The method further includes dynamically controlling each of the addressing optical beams being provided by using a respective channel in a multi-channel acousto-optic modulator (AOM) to implement, with the ion chain, one or more quantum gates in a sequence of quantum gates of the quantum operation. Aspects of a quantum information processing (QIP) system that includes the multi-channel AOM for performing the method are also described.