Flux control of qubit under resonant excitation
AssigneeNorthrop Grumman Systems Corporation
InventorJames Redding Medford
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Abstract
Systems and methods are provided for flux control of a qubit. A quantum system includes a microwave transmitter configured to provide a continuous microwave tone, and a qubit configured such that a portion of an energy spectrum of the qubit is responsive to an applied flux. The qubit also has an inductive element responsive to the continuous microwave tone to produce a Rabi oscillation within the qubit. A flux source is configured to apply a flux to the qubit.
Claims8
A method for performing a Y rotation of a qubit configured such that the qubit is responsive to the continuous microwave tone to produce a Rabi oscillation within the qubit and a portion of an energy spectrum of the qubit is responsive to an applied flux, the method comprising:
- providing a continuous microwave tone to the qubit;
- providing a flux pulse to the qubit as to detune the energy spectrum of the qubit from a frequency of the Rabi oscillation by a first predetermined amount for a predetermined time;
- and
- adjusting the flux pulse to the qubit as to detune the energy spectrum of the qubit from a frequency of the Rabi oscillation by a second predetermined amount for the predetermined time, wherein the second predetermined amount is the additive inverse of the first predetermined amount.
A quantum system comprising:
- a microwave transmitter configured to provide a continuous microwave tone;
- a qubit configured such that a portion of an energy spectrum of the qubit is linearly dependent on an applied flux, the qubit having an inductive element responsive to the continuous microwave tone to produce a Rabi oscillation within the qubit;
- a flux source configured to apply a flux to the qubit;
- and
- a system control configured to control the flux source as to selectively apply flux to the qubit, such that a qubit resonance frequency associated with the energy spectrum of the qubit can be selectively tuned to a frequency of the Rabi oscillation, the system control being configured to tune the qubit resonance frequency such that the detuning is pulsed symmetrically around a zero point, such that the qubit resonant frequency is detuned from the frequency of the Rabi oscillation by a first amount for a predetermined period of time and then detuned from the frequency of the Rabi oscillation by a second amount for the predetermined period of time, where the second amount is the additive inverse of the first amount.
Dependencies are inferred from the claim text.