公开(公告)号：GB2628721B

公开(公告)日：2025-05-07

申请号：GB202407066

申请日：2022-08-23

Applicant: IBM

Inventor： ABHINAV KANDALA ,  DAVID MCKAY ,  SRIKANTH SRINIVASAN ,  EASWAR MAGESAN ,  JAY GAMBETTA

IPC: G06N10/70

Abstract: Systems and techniques that facilitate Stark shift cancellation are provided. In various embodiments, a system can comprise a control qubit that is coupled to a target qubit. In various cases, the control qubit can be driven by a first tone that entangles the control qubit with the target qubit. In various aspects, the control qubit can be further driven by a second tone simultaneously with the first tone. In various cases, the second tone can have an opposite detuning sign than the first tone. In various instances, the first tone can cause a Stark shift in an operational frequency of the control qubit, and the second tone can cancel the Stark shift.

公开(公告)号：GB2628721A8

公开(公告)日：2025-04-09

申请号：GB202407066

申请日：2022-08-23

Applicant: IBM

Inventor： ABHINAV KANDALA ,  DAVID MCKAY ,  SRIKANTH SRINIVASAN ,  EASWAR MAGESAN ,  JAY GAMBETTA

IPC: G06N10/70

Abstract: Systems and techniques that facilitate Stark shift cancellation are provided. In various embodiments, a system can comprise a control qubit that is coupled to a target qubit. In various cases, the control qubit can be driven by a first tone that entangles the control qubit with the target qubit. In various aspects, the control qubit can be further driven by a second tone simultaneously with the first tone. In various cases, the second tone can have an opposite detuning sign than the first tone. In various instances, the first tone can cause a Stark shift in an operational frequency of the control qubit, and the second tone can cancel the Stark shift.

公开(公告)号：IL297571A

公开(公告)日：2022-12-01

申请号：IL29757122

申请日：2022-10-23

Applicant: IBM ,  DAVID C MCKAY ,  ABHINAV KANDALA ,  SRIKANTH SRINIVASAN

Inventor： DAVID C MCKAY ,  ABHINAV KANDALA ,  SRIKANTH SRINIVASAN

IPC: G06N10/00 ,  H03K17/92

Abstract: Systems and techniques that facilitate multi-resonant couplers for preserving ZX interaction while reducing ZZ interaction are provided. In various embodiments, a first qubit can have a first operational frequency and a second qubit can have a second operational frequency, and a multi-resonant architecture can couple the first qubit to the second qubit. In various embodiments, the multi-resonant architecture can comprise a first resonator and a second resonator. In various cases, the first resonator can capacitively couple the first qubit to the second qubit, and a second resonator can capacitively couple the first qubit to the second qubit. In various aspects, the first resonator and the second resonator can be in parallel. In various instances, the first resonator can have a first resonant frequency less than the first operational frequency and the second operational frequency, and the second resonator can have a second resonant frequency greater than the first operational frequency and the second operational frequency. In various other embodiments, the multi-resonant architecture can comprise a resonator, a first end of which can be capacitively coupled to the first qubit and to the second qubit, and a second end of which can be coupled to ground. In various instances, the resonator can have a first harmonic less than the first operational frequency and the second operational frequency, and can have a second harmonic greater than the first operational frequency and the second operational frequency. In various other embodiments, the multi-resonant architecture can comprise a resonator and a direct coupler. In various embodiments, the resonator and the direct coupler can both capacitively couple the first qubit to the second qubit, and the resonator and the direct coupler can be in parallel. In various cases, the direct coupler can couple opposite pads of the first qubit and the second qubit. In various embodiments, a first end of the resonator can be capacitively coupled to the first qubit and the second qubit, a second end of the resonator can be coupled to ground, and the direct coupler can capacitively couple common pads of the first qubit and the second qubit.