Christopher J Monroe

US Patent:

20210406757, Dec 30, 2021

Filed:

Jun 29, 2021

Appl. No.:

17/362810

Inventors:

- College Park MD, US
- Durham NC, US
Christopher MONROE - Ellicott City MD, US

International Classification:

G06N 10/00

Abstract:

Aspects of the present disclosure describe techniques that involve an active stabilization of coherent controllers using nearby qubits. In an aspect, a quantum information processing (QIP) system for stabilizing phase damping in qubits is described that provides a first and a second qubit ion, measuring magnetic field fluctuations using the second qubit ion, and generates one or more magnetic fields based on the measured magnetic field fluctuations, the one or more magnetic fields being applied near the first qubit ion to cancel the magnetic field fluctuations to stabilize the phase damping of the first qubit ion. Another such QIP system performs provides a first and a second qubit ion, locks a local oscillator to a frequency reference associated with the second qubit ion, and tracks, using the local oscillator, a frequency of the first qubit ion based on the frequency reference. Methods associated with these QIP systems are also described.

US Patent:

20190378033, Dec 12, 2019

Filed:

Jun 6, 2019

Appl. No.:

16/433950

Inventors:

- College Park MD, US
Norbert M. LINKE - Stevenson MD, US
Kevin A. LANDSMAN - Rockville MD, US
Daiwei ZHU - College Park MD, US
Dmitri MASLOV - Falls Church VA, US
Christopher MONROE - Columbia MD, US

International Classification:

G06N 10/00
G06F 7/501

Abstract:

The disclosure describes various aspects related to enabling effective multi-qubit operations, and more specifically, to techniques for enabling parallel multi-qubit operations on a universal ion trap quantum computer. In an aspect, a method of performing quantum operations in an ion trap quantum computer or trapped-ion quantum system includes implementing at least two parallel gates of a quantum circuit, each of the at least two parallel gates is a multi-qubit gate, each of the at least two parallel gates is implemented using a different set of ions of a plurality of ions in a ion trap, and the plurality of ions includes four or more ions. The method further includes simultaneously performing operations on the at least two parallel gates as part of the quantum operations. A trapped-ion quantum system and a computer-readable storage medium corresponding to the method described above are also disclosed.