US 12,332,973 B2
Quantum state classifier using reservoir computing
Naoki Kanazawa, Yokohama (JP)
Assigned to INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed by INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed on Mar. 20, 2023, as Appl. No. 18/186,503.
Application 18/186,503 is a continuation of application No. 16/570,592, filed on Sep. 13, 2019, granted, now 11,681,908.
Prior Publication US 2024/0354563 A1, Oct. 24, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06N 10/00 (2022.01); G06F 18/2415 (2023.01); G06N 3/044 (2023.01); G06N 3/065 (2023.01); G06N 3/08 (2023.01); G06N 10/40 (2022.01)
CPC G06F 18/2415 (2023.01) [G06N 3/044 (2023.01); G06N 3/065 (2023.01); G06N 3/08 (2013.01); G06N 10/40 (2022.01)] 25 Claims
OG exemplary drawing
 
1. A quantum state classifier, comprising:
a reservoir computing circuit to post-process a quantum bit to obtain a readout signal;
a linear readout circuit, operatively coupled to the reservoir computing circuit, to discriminate a quantum state of the quantum bit from the readout signal from among multiple possible quantum states, the linear readout circuit being trained in a calibration process respectively activated by a specific one of each of the multiple quantum states such that weights within the linear readout circuit are updated by minibatch learning for each of multiple measurement sequences of the calibration process, wherein the linear readout circuit generates a binary output after the multiple measurement sequences in a post-calibration classification process for a test quantum bit, the binary output being generated by a comparator that binarizes a pre-processed signal representative of the quantum bit; and
a controller, operatively coupled to the linear readout circuit, selectively triggerable using a microwave switch to output a control pulse responsive to the quantum state of the test quantum bit indicated by the binary output.