The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 2018
Filed:
Mar. 09, 2017
Socpra Sciences ET Génie S.e.c., Sherbrooke, QC OT, CA;
Jerome Bourassa, Sherbrooke, QC, CA;
Alexandre Blais, Sherbrooke, QC, CA;
Nicloas Didier, Saint Sulpice, FR;
SOCPRA Sciences et Génie s.e.c., Sherbrooke, QC, CA;
Abstract
Method and circuit for reading a value {circumflex over (σ)}stored in a quantum information unit (qubit) memory having a qubit frequency ω, with a resonator defined by a resonator damping rate κ, a resonator frequency ω, a resonator electromagnetic field characterized by âand â, a longitudinal coupling strength g, an output âand a longitudinal coupling g{circumflex over (σ)}(â+â). At a quantum non-demolition (QND) longitudinal modulator, periodically modulating the longitudinal coupling strength gwith a signal of amplitude {tilde over (g)}at least three (3) times greater than the resonator damping rate κ and of frequency ωwith ω+κ resonant with ω, wherein the longitudinal coupling strength gvaries over time (t) in accordance with g(t)=+{tilde over (g)}cos(ωt) withrepresenting an average value of gand at a QND homodyne detector, measuring the value {circumflex over (σ)}of the qubit memory from a phase reading of the output {circumflex over (σ)}.