US 12,086,688 B2
Compensation pulses for qubit readout
Julian Shaw Kelly, Santa Barbara, CA (US); and Daniel Thomas Sank, Goleta, CA (US)
Assigned to Google LLC, Mountain View, CA (US)
Filed by Google LLC, Mountain View, CA (US)
Filed on May 19, 2022, as Appl. No. 17/748,938.
Application 17/748,938 is a continuation of application No. 16/468,150, granted, now 11,367,011, previously published as PCT/US2016/066359, filed on Dec. 13, 2016.
Prior Publication US 2022/0277214 A1, Sep. 1, 2022
Int. Cl. G06N 10/00 (2022.01); B82Y 10/00 (2011.01)
CPC G06N 10/00 (2019.01) [B82Y 10/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
performing a quantum computation using one or more qubits that operate at respective qubit frequencies, wherein the quantum computation comprises a measurement operation of a qubit included in the one or more qubits;
during the quantum computation, performing the measurement operation by measuring the qubit to determine a state of the qubit, comprising applying a pre-determined compensation pulse to the qubit during the measurement operation to maintain the qubit frequency by avoiding uncontrolled shifts in qubit frequency, wherein
the compensation pulse is determined by sequentially varying an initial compensation pulse at each of a plurality of time steps and measuring a shift in frequency during a measurement operation using the varied initial compensation pulse until a resulting measured shift in frequency is lower than a predetermined acceptable shift.