Multipole multiband isolator devices

Patent metadata

Field	Value
Publication number	US-12500324-B2
Application number	US-202318344977-A
Country	US
Kind code	B2
Filing date	Jun 30, 2023
Priority date	Jun 30, 2023
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

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.

First claim

What is claimed is:

1 . 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.

2 . The device of claim 1 , wherein the first bandpass filter and the second bandpass filter each comprise an immittance inverting bandpass filter.

3 . The device of claim 1 , wherein the non-linear mixing devices are driven by respective control signals having a same frequency and different phases.

4 . The device of claim 3 , wherein the respective control signals have similar or different amplitudes.

5 . The device of claim 1 , wherein:
the first bandpass filter comprises a first passband with a first center frequency; the second bandpass filter comprises a second passband with a second center frequency; the first passband and the second passband are non-overlapping passbands; and the control signals are applied to the non-linear mixing devices and comprise radio frequency signals having a frequency which is a function of a difference between the first center frequency and the second center frequency.

6 . The device of claim 1 , wherein the non-linear mixing devices comprise direct current superconducting quantum interference devices.

7 . The device of claim 1 , wherein the non-linear mixing devices comprise Josephson parametric converter devices, wherein each Josephson parametric converter device comprises a Josephson ring modulator which is configured to couple respective poles of the first bandpass filter and the second bandpass filter.

8 . The device of claim 1 , wherein:
the first bandpass filter comprises a first terminal that is connected to the first port and a second terminal that is connected to the second port; the second bandpass filter comprises a first terminal that is terminated and a second terminal that is terminated.

9 . 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.

10 . The system of claim 9 , wherein the first bandpass filter and the second bandpass filter of the isolator circuit each comprise an immittance inverting bandpass filter.

11 . The system of claim 9 , wherein the non-linear mixing devices of the isolator circuit are driven by respective control signals having a same frequency and different phases.

12 . The system of claim 11 , wherein the respective control signals have similar or different amplitudes.

13 . The system of claim 9 , wherein:
the first bandpass filter comprises a first passband with a first center frequency; the second bandpass filter comprises a second passband with a second center frequency; the first passband and the second passband are non-overlapping passbands; and the control signals are applied to the non-linear mixing devices and comprise radio frequency signals having a frequency which is a function of a difference between the first center frequency and the second center frequency.

14 . The system of claim 9 , wherein the non-linear mixing devices comprise direct current superconducting quantum interference devices.

15 . The system of claim 9 , wherein the non-linear mixing devices comprise Josephson parametric converter devices, wherein each Josephson parametric converter device comprises a Josephson ring modulator which is configured to couple respective poles of the first bandpass filter and the second bandpass filter.

16 . The system of claim 9 , wherein:
the first bandpass filter comprises a first terminal that is connected to the first port and a second terminal that is connected to the second port; the second bandpass filter comprises a first terminal that is terminated and a second terminal that is terminated.

17 . 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.

18 . The device of claim 17 , wherein:
the first multipole immittance inverting bandpass filter comprises a first passband with a first center frequency; the second multipole immittance inverting bandpass filter comprises a second passband with a second center frequency; the first passband and the second passband are non-overlapping passbands; and the given frequency of the control signal is a function of a difference between the first center frequency and the second center frequency.

19 . 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.

20 . The system of claim 19 , wherein:
the first multipole immittance inverting bandpass filter comprises a first passband with a first center frequency; the second multipole immittance inverting bandpass filter comprises a second passband with a second center frequency; the first passband and the second passband are non-overlapping passbands; and the given frequency of the control signal is a function of a difference between the first center frequency and the second center frequency.

21 . The system of claim 19 , further comprising a signal generator configured to generate the control signal, wherein the control signal comprises a radio frequency current signal, and a control line which is coupled to the transmission line and configured to transmit the control signal from the signal g

Assignees

• IBM

Inventors

• Beck Matthew
• Selvanayagam Michael Karunendra
• Mancini Corrado P

Classifications

• H01P1/397

  using non- reciprocal phase shifters (H01P1/393 takes precedence) · CPC title

• H10N60/12

  Josephson-effect devices · CPC title

• H03H11/04

  Frequency selective two-port networks · CPC title

• H03D7/005

  by means of superconductive devices · CPC title

• H03H7/0123

  comprising distributed impedance elements together with lumped impedance elements · CPC title