Current device readout system
AssigneeNorthrop Grumman Systems Corporation
InventorsAnthony Joseph Przybysz, David George Ferguson, Moe S. Khalil
Life of this patent
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Abstract
One example includes a current device readout system. The system includes a tunable resonator having a resonant frequency that is associated with a current state of a current device. The tunable resonator can be configured to receive a tone signal having a predetermined frequency from a feedline to determine the current state of the current device. The system also includes an isolation device inductively interconnecting the tunable resonator and the current device. The isolation device can be tunable to isolate the current device in a first state and to facilitate the determination of the current state of the current device in a second state.
Claims20
A current device readout system comprising:
- a tunable resonator having a resonant frequency that is associated with a current state of a current device, the tunable resonator being configured to receive a tone signal having a predetermined frequency from a feedline to determine the current state of the current device;
- and
- an isolation device configured as a quantum flux parametron (QFP) inductively interconnecting the tunable resonator and the current device, the QFP being tunable based on a static flux to set a threshold to facilitate amplification of the current state of the current device, wherein the QFP is configured to isolate the current device in a first state and the tunable resonator and is configured to provide an amplified current state of the current device in a second state to the tunable resonator to facilitate the determination of the current state of the current device in the second state.
A method for reading a current state of a current device, the method comprising:
- providing a first flux bias to a quantum flux parametron (QFP) that inductively interconnects a tunable resonator and the current device to set the QFP to a first QFP state to inductively isolate the tunable resonator and the current device, the QFP being tunable based on a static flux to set a threshold to facilitate amplification of the current state of the current device, wherein the current state of the current device corresponds to one of a first current state and a second current state;
- providing a second bias flux to the QFP to set the QFP to a second QFP state to set a resonant frequency of the tunable resonator associated with the current state of the current device, the QFP being configured to provide an amplified current state of the current device in the second current state to the tunable resonator based on the second bias flux;
- providing to the tunable resonator a tone signal having a predetermined frequency from a feedline;
- and
- monitoring the feedline in response to providing the tone signal to determine the current state of the current device.
A current device readout system comprising:
- a tunable resonator having a resonant frequency that is associated with a current state of a flux qubit, the tunable resonator being configured to receive a tone signal having a predetermined frequency from a feedline to determine the current state of the flux qubit;
- and
- a quantum flux parametron (QFP) inductively interconnecting the tunable resonator and the flux qubit, the QFP being tunable to inductively isolate the flux qubit and the tunable resonator in a first QFP state and to amplify the current state of the current device to facilitate the determination of the current state of the current device in a second QFP state, wherein the QFP comprises an inductor that is tuned by a static flux to set a threshold to facilitate amplifying the current state of the current device as one a first current state and a second current state in the second state of the QFP.
Dependencies are inferred from the claim text.