Multipole multiband isolator devices
AssigneeInternational Business Machines Corporation
InventorsMatthew Beck, Michael Karunendra Selvanayagam, Corrado P Mancini
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Abstract
A device comprises filter circuitry and non-linear mixing devices. The filter circuitry comprises a first port, a second port, a first bandpass filter, and a second bandpass filter. The non-linear mixing devices are responsive to control signals to couple poles of the first bandpass filter to respective poles of the second bandpass filter to cause non-reciprocal transmission of signals from the first port to the second port.
Claims25
A device, comprising:
- filter circuitry comprising a first port, a second port, a first bandpass filter, and a second bandpass filter;
- and
- non-linear mixing devices which are responsive to control signals to couple poles of the first bandpass filter to respective poles of the second bandpass filter to cause non-reciprocal transmission of signals from the first port to the second port.
A system, comprising:
- a quantum processor comprising quantum bits;
- a readout signal path configured to transmit signals that are readout from one or more of the quantum bits of the quantum processor, the readout signal path comprising an isolator circuit which comprises:
- filter circuitry comprising a first port, a second port, a first bandpass filter, and a second bandpass filter;
- and
- non-linear mixing devices which are responsive to control signals to couple poles of the first bandpass filter to respective poles of the second bandpass filter to cause non-reciprocal transmission of signals through the isolator circuit from the first port to the second port.
A device, comprising:
- an isolator circuit, wherein the isolator circuit comprises:
- a first port and a second port;
- a first multipole immittance inverting bandpass filter;
- a second multipole immittance inverting bandpass filter;
- non-linear mixing devices which couple poles of the first multipole immittance inverting bandpass filter to respective poles of the second multipole immittance inverting bandpass filter;
- and
- a transmission line commonly coupled to each of the non-linear mixing devices, and configured to apply a control signal to each of the non-linear mixing devices at a given frequency with different phase shifts, to cause non-reciprocal transmission of signals from the first port to the second port of the isolator circuit.
A system, comprising:
- a quantum processor comprising quantum bits;
- a readout signal path configured to transmit signals that are readout from one or more of the quantum bits of the quantum processor, the readout signal path comprising an isolator circuit which comprises:
- a first port and a second port;
- a first multipole immittance inverting bandpass filter;
- a second multipole immittance inverting bandpass filter;
- non-linear mixing devices which couple poles of the first multipole immittance inverting bandpass filter to respective poles of the second multipole immittance inverting bandpass filter;
- and
- a transmission line commonly coupled to each of the non-linear mixing devices, and configured to apply a control signal to each of the non-linear mixing devices at a given frequency with different phase shifts, to cause non-reciprocal transmission of signals from the first port to the second port of the isolator circuit.
A method comprising applying control signals to non-linear mixing devices, configured to couple poles of a first bandpass filter to respective poles of a second bandpass filter, to cause non-reciprocal transmission of signals from a first port of the first bandpass filter to a second port of the first bandpass filter.
Dependencies are inferred from the claim text.