US 11,727,297 B2
Tunable quantum coupler facilitating a quantum gate between qubits
Jiri Stehlik, New York, NY (US); Devin L. Underwood, Bronx, NY (US); David Zajac, New York, NY (US); and Matthias Steffen, Mount Kisco, NY (US)
Assigned to INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed by International Business Machines Corporation, Armonk, NY (US)
Filed on Jun. 24, 2020, as Appl. No. 16/910,286.
Prior Publication US 2021/0406746 A1, Dec. 30, 2021
Int. Cl. G06N 10/40 (2022.01); G06N 10/00 (2022.01); H01L 29/66 (2006.01)
CPC G06N 10/00 (2019.01) [G06N 10/40 (2022.01); H01L 29/66977 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A quantum coupler device, comprising:
a tunable coupler coupled between a first terminal of a first qubit and a second terminal of a second qubit, the first terminal and the second terminal having a same polarity, wherein the tunable coupler is configured to control a first coupling between the first qubit and the second qubit; and
a capacitor device coupled to the first terminal and a third terminal of the second qubit, the first terminal and the third terminal having an opposite polarity, wherein the capacitor device is configured to provide a second coupling opposite in sign relative to the first coupling and based on a resonant frequency of the tunable coupler being smaller than a resonant frequency of both the first qubit and the second qubit.