Using superconducting microwave gyrator for parity detection of weak magnetic sources

Patent metadata

Field	Value
Publication number	US-11403168-B2
Application number	US-202016805212-A
Country	US
Kind code	B2
Filing date	Feb 28, 2020
Priority date	Feb 28, 2020
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

A method of detecting parity of weak magnetic fields includes inputting a first electromagnetic pump drive to a first three-wave mixing Josephson device via a first 90 deg. hybrid; inputting a second electromagnetic pump drive to a second three-wave mixing Josephson device through the first 90 deg. hybrid; and inputting a first electromagnetic wave via a second 90 deg. hybrid connected to the first three-wave mixing Josephson device to output a second electromagnetic wave through the second three-wave mixing Josephson device. The method includes transmitting a third electromagnetic wave via the second 90 deg. hybrid to a third 90 deg. hybrid; and detecting a parity of a first magnet field applied by a first magnetic source and a second magnetic field applied by a second magnetic source based on constructive wave interference or destructive wave interference of the second electromagnetic wave and the third electromagnetic wave.

First claim

I claim:

1. A method of detecting parity of weak magnetic fields comprising:
inputting a first electromagnetic pump drive having a first pump phase to a first three-wave mixing Josephson device;
inputting a second electromagnetic pump drive having a second pump phase to a second three-wave mixing Josephson device, the first pump phase and the second pump phase being shifted relative to each other by approximately 90 deg. (pi/2), and an input of the second three-wave mixing Josephson device being coupled to an output of the first three-wave mixing Josephson device;
inputting a first electromagnetic wave to the first three-wave mixing Josephson device to output a second electromagnetic wave after passing through the second three-wave mixing Josephson device, or inputting the first electromagnetic wave to the second three wave mixing Josephson device to output a third electromagnetic wave after passing through the first three-wave mixing Josephson device; and
detecting a parity of an orientation of a first magnetic field applied by a first magnetic source to the first three-wave mixing device and a second magnetic field applied by a second magnetic source to the second three-wave mixing device based on a first phase of the first electromagnetic wave, a second phase of the second electromagnetic wave, a third phase of the third electromagnetic wave, a first pump phase of the first electromagnetic pump drive and a second pump phase of the second electromagnetic pump drive.

2. The method according to claim 1 , wherein detecting the parity comprises detecting an even parity when the second pump phase is substantially equal to the first pump phase plus 90 deg., the first phase of the first electromagnetic wave is substantially equal to the second phase of the second electromagnetic wave modulo 360 deg., and the third phase of the third electromagnetic wave is substantially equal to the first phase plus 180 deg. modulo 360 deg.

3. The method according to claim 1 , wherein detecting the parity comprises detecting an even parity when the first pump phase is substantially equal to the second pump phase plus 90 deg., the second phase of the second electromagnetic wave is substantially equal to the first phase of the first electromagnetic wave plus 180 deg. modulo 360 deg., and the third phase of the third electromagnetic wave is substantially equal to the first phase modulo 360 deg.

4. The method according to claim 1 , wherein detecting the parity comprises detecting an odd parity when the second pump phase is substantially equal to the first pump phase plus 90 deg., the second phase of the second electromagnetic wave is substantially equal to the first phase of the first electromagnetic wave plus 180 deg. modulo 360 deg., and when the third phase of the third electromagnetic wave is substantially equal to the first phase modulo 360 deg.

5. The method according to claim 1 , wherein detecting the parity comprises detecting an odd parity when the first pump phase is substantially equal to the second pump phase plus 90 deg., the second phase of the second electromagnetic wave is substantially equal to the first phase modulo 360 deg. of the first electromagnetic wave, and when the third phase of the third electromagnetic wave is substantially equal to the first phase plus 180 deg. modulo 360 deg.

6. The method according to claim 1 , wherein inputting the first electromagnetic pump drive having the first pump phase to the first three-wave mixing Josephson device comprises inputting the first electromagnetic pump drive to a first three-wave mixing Josephson device via a first 90 deg. hybrid.

7. The method according to claim 6 , wherein inputting the second electromagnetic pump drive having the second pump phase to the second three-wave mixing Josephson device comprises inputting the second electromagnetic pump drive to the second three-wave mixing Josephson device through the first 90 deg. hybrid.

8. The method according to claim 1 , wherein detecting the parity of the first magnet field and the second magnetic field comprises detecting an even parity when the first and the second magnetic fields are oriented substantially in a same direction.

9. The method according to claim 1 , wherein detecting the parity of the first magnet field and the second magnetic field comprises detecting an odd parity when the first and the second magnetic fields are oriented substantially in opposite directions.

10. A method of detecting parity of weak magnetic fields comprising:
inputting a first electromagnetic pump drive to a first three-wave mixing Josephson device via a first 90 deg. hybrid;
inputting a second electromagnetic pump drive to a second three-wave mixing Josephson device through the first 90 deg. hybrid, an input of the second three-wave mixing Josephson device being coupled to an output of the first three-wave mixing Josephson device;
inputting a first electromagnetic wave via a second 90 deg. hybrid connected to the first three-wave mixing Josephson device to output a second electromagnetic wave through the second three-wave mixing Josephson device;
transmitting a third electromagnetic wave via the second 90 deg. hybrid to a third 90 deg. hybrid connected to the second three-wave mixing Josephson device;
detecting a parity of a first magnet field applied by a first magnetic source to the first three-wave mixing device and a second magnetic field applied by a second magnetic source to the second three-wave mixing device based on constructive wave interference or destructive wave interference of the second electromagnetic wave and the third electromagnetic wave after passing through the third 90 deg. hybrid at the output of the third 90 deg. hybrid.

11. The method according to claim 10 , wherein inputting the first electromagnetic pump drive comprises inputting the first electromagnetic pump drive having a first pump phase and inputting a second electromagnetic pump drive having a second pump phase shifted relative to the first pump phase by 90 deg. (pi/2).

12. The method according to claim 10 , wherein inputting the first electromagnetic wave via the second 90 deg. hybrid to output the second electromagnetic wave comprises inputting the first electromagnetic wave having a first phase to output the second electromagnetic wave having a second phase that is substantially equal to the first phase or substantially equal to the first phase plus 180 deg. (pi).

13. The method according to claim 10 , wherein transmitting the third electromagnetic wave via the second 90 deg. hybrid to the third 90 deg. hybrid comprises transmitting the third electromagnetic wave having a third phase that is substantially equal to a first phase of the first electromagnetic wave plus 90 deg.

14. The method according to claim 13 , wherein transmitting the third electromagnetic wave via the second 90 deg. hybrid to the third 90 deg. hybrid further comprises adding a 90 deg. phase shift to the third phase of the third electromagnetic wave to obtain a third electromagnetic wave having a third phase that is substantially equal to the first phase plus 180 deg.

15. The method according to claim 10 , wherein detecting the parity of the first magnet field and the second magnetic field based on constructive wave interference or destructive wave interference at the output of the third 90 deg. hybrid comprises detecting a constructive interference of the second electromagnetic wave and the third electromagnetic wave when a third phase of the third electromagnetic wave at the output of the third 90 deg. hybrid substantially matches a second phase of the second electromagnetic wave output at

Assignees

• IBM

Inventors

• Abdo Baleegh

Classifications

• G06F11/1008 Primary

  in individual solid state devices (G06F11/1004 takes precedence) · CPC title

• G06N10/40

  Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control · CPC title

• H01L39/2493

  Electricity · mapped topic

• G06N10/00

  Quantum computing, i.e. information processing based on quantum-mechanical phenomena · CPC title

• H10N60/0912

  of Josephson-effect devices · CPC title