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US 11,777,462 B2Granted
Amplifier frequency matching for qubit readout
AssigneeGoogle Inc.
InventorsTheodore Charles White, Julian Shaw Kelly
Life of this patent
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Abstract
A quantum computing devices includes: a qubit; a readout device coupled to the qubit, the readout device including a frequency filter having a filter frequency range; and an amplifier device coupled to the readout device, in which the amplifier device is configured to amplify a measurement signal from the readout device upon receiving a pump signal having a pump frequency that is outside of the filter frequency range of the frequency filter.
Claims36
A quantum computing device comprising:
- a qubit;
- a readout device coupled to the qubit, the readout device comprising a frequency filter having a filter frequency range, wherein the readout device comprises a measurement resonator, wherein the frequency filter is configured to attenuate transmission of signals outside of the filter frequency range;
- and
- an amplifier device coupled to the readout device, wherein the amplifier device is configured to amplify a measurement signal from the readout device upon receiving a pump signal having a pump frequency that is outside of the filter frequency range of the frequency filter.
1 more element
A method of measuring a state of a qubit, the method comprising:
- applying a probe signal to a readout device that is coupled to the qubit to produce, from the readout device, a measurement signal indicative of the state of the qubit, wherein the readout device comprises a frequency filter having a filter frequency range, wherein the frequency filter attenuates transmission of signals outside of the filter frequency range, wherein a bandwidth of the filter frequency range is about 200 MHz;
- transmitting a pump signal to an amplifier device arranged to receive the measurement signal from the readout device, such that the amplifier device amplifies the measurement signal,
- wherein the pump signal has a pump frequency that is outside of the filter frequency range;
- and
- detecting the amplified measurement signal.
2 more elements
A method of measuring a state of a qubit, the method comprising:
- applying a probe signal to a readout device that is coupled to the qubit to produce, from the readout device, a measurement signal indicative of the state of the qubit, wherein the readout device comprises a frequency filter having a filter frequency range, wherein the frequency filter attenuates transmission of signals outside of the filter frequency range, wherein an operating frequency of the qubit is outside of the filter frequency range;
- transmitting a pump signal to an amplifier device arranged to receive the measurement signal from the readout device, such that the amplifier device amplifies the measurement signal,
- wherein the pump signal has a pump frequency that is outside of the filter frequency range;
- and
- detecting the amplified measurement signal.
2 more elements
A method of measuring a state of a qubit, the method comprising:
- applying a probe signal to a readout device that is coupled to the qubit to produce, from the readout device, a measurement signal indicative of the state of the qubit, wherein the readout device comprises a frequency filter having a filter frequency range, wherein the frequency filter attenuates transmission of signals outside of the filter frequency range, wherein the frequency filter comprises a bandpass filter or a high pass filter;
- transmitting a pump signal to an amplifier device arranged to receive the measurement signal from the readout device, such that the amplifier device amplifies the measurement signal,
- wherein the pump signal has a pump frequency that is outside of the filter frequency range;
- and
- detecting the amplified measurement signal.
2 more elements
A quantum computing device comprising:
- a qubit;
- a readout device coupled to the qubit, the readout device comprising a frequency filter having a filter frequency range, and the readout device comprising a measurement resonator;
- and
- an amplifier device coupled to the readout device, wherein the frequency filter is configured to attenuate signals reflected from the amplifier device toward the frequency filter, the reflected signals having frequencies that are outside of the filter frequency range.
1 more element
A quantum computing device comprising:
- a qubit;
- a readout device coupled to the qubit, the readout device comprising a frequency filter having a filter frequency range, wherein the frequency filter is configured to attenuate transmission of signals outside of the filter frequency range;
- and
- an amplifier device coupled to the readout device, wherein the amplifier device is configured to amplify a measurement signal from the readout device upon receiving a pump signal having a pump frequency that is outside of the filter frequency range of the frequency filter, and wherein the amplifier device comprises a traveling wave parametric amplifier (TWPA).
1 more element
A quantum computing device comprising:
- a qubit;
- a readout device coupled to the qubit, the readout device comprising a frequency filter having a filter frequency range, wherein the frequency filter is configured to attenuate transmission of signals outside of the filter frequency range;
- an amplifier device coupled to the readout device, wherein the amplifier device is configured to amplify a measurement signal from the readout device upon receiving a pump signal having a pump frequency that is outside of the filter frequency range of the frequency filter;
- and
- a substrate, wherein the qubit, the readout device and the amplifier device are integrated on the substrate.
2 more elements
A quantum computing device comprising:
- a qubit;
- a readout device coupled to the qubit, the readout device comprising a frequency filter having a filter frequency range, wherein the frequency filter is configured to attenuate transmission of signals outside of the filter frequency range, wherein the frequency filter comprises a bandpass filter or a high pass filter;
- and
- an amplifier device coupled to the readout device, wherein the amplifier device is configured to amplify a measurement signal from the readout device upon receiving a pump signal having a pump frequency that is outside of the filter frequency range of the frequency filter.
1 more element
A method of measuring a state of a qubit, the method comprising:
- applying a probe signal to a readout device that is coupled to the qubit to produce, from the readout device, a measurement signal indicative of the state of the qubit, wherein the readout device comprises a frequency filter having a filter frequency range, wherein the frequency filter attenuates transmission of signals outside of the filter frequency range, wherein the readout device comprises a measurement resonator;
- transmitting a pump signal to an amplifier device arranged to receive the measurement signal from the readout device, such that the amplifier device amplifies the measurement signal,
- wherein the pump signal has a pump frequency that is outside of the filter frequency range;
- and
- detecting the amplified measurement signal.
2 more elements
Dependencies are inferred from the claim text.