Multimode Josephson parametric converter: coupling Josephson ring modulator to metamaterial

Patent metadata

Field	Value
Publication number	US-10056885-B2
Application number	US-201715443120-A
Country	US
Kind code	B2
Filing date	Feb 27, 2017
Priority date	Sep 30, 2015
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A technique relates to operating a multimode Josephson parametric converter as a multimode quantum limited amplifier. The multimode Josephson parametric converter receives multiple quantum signals in parallel at different resonance frequencies. The multimode Josephson parametric converter amplifies simultaneously the multiple quantum signals, according to pump signals applied to the multimode Josephson parametric converter. The multiple quantum signals having been amplified at the different resonance frequencies are reflected, according to the pump signals.

First claim

What is claimed is:

1. A method of remote entanglement of multiple qubits by measurement, the method comprising:
receiving, by a first multimode resonator in a multimode Josephson parametric converter, a first group of readout signals resonant with resonance modes of the first multimode resonator, wherein the first multimode resonator is a first left-handed transmission line;
receiving, by a second multimode resonator in the multimode Josephson parametric converter, a second group of readout signals resonant with resonance modes of the second multimode resonator, wherein the second multimode resonator is a second left-handed transmission line;
receiving pump signals, by the second multimode resonator, wherein the pump signals are a first pump signal through a last pump signal; and
generating, by the multimode Josephson parametric converter, a first qubit pair based on the first pump signal through an N qubit pair based on the last pump signal, in response to receiving the first group of readout signals and receiving the second group of readout signals, wherein the first and second multimode resonators are coupled together in the multimode Josephson parametric converter, wherein N is an integer.

2. The method of claim 1 , wherein the first pump signal is a summation of one resonance frequency of the first group plus one resonance frequency of the second group.

3. The method of claim 2 , wherein a second pump signal is a summation of another resonance frequency of the first group plus another resonance frequency of the second group.

4. The method of claim 3 , wherein the last pump signal is a summation of yet another resonance frequency of the first group plus yet another resonance frequency of the second group.

5. The method of claim 4 , wherein the first group of readout signals is received from first readout resonators, the first readout resonators being coupled to first qubits.

6. The method of claim 5 , wherein the second group of readout signals is received from second readout resonators, the second readout resonators being coupled to second qubits.

7. The method of claim 6 , wherein one qubit in the first qubits has been readout at the one resonance frequency of the first group and one qubit in the second qubits has been readout at the one resonance frequency of the second group, such that the first qubit pair is the one qubit in the first qubits and the one qubit in the second qubits, in response to the first pump signal of the pump signals.

8. The method of claim 7 , wherein another qubit in the first qubits has been readout at the another resonance frequency of the first group and another qubit in the second qubits has been readout at the another resonance frequency of the second group, such that the second qubit pair is the another qubit in the first qubits and the another qubit in the second qubits, in response to the second pump signal of the pump signals.

9. The method of claim 8 , wherein yet another qubit in the first qubits has been readout at the yet another resonance frequency of the first group and yet another qubit in the second qubits has been readout at the yet another resonance frequency of the second group, such that the N qubit pair is the yet another qubit in the first qubits and the yet another qubit in the second qubits, in response to the last pump signal of the pump signals.

10. The method of claim 1 , wherein the first readout resonators have readout resonator frequencies that coincide with the resonance modes of the first multimode resonator.

11. The method of claim 10 , wherein the second readout resonators have readout resonator frequencies that coincide with the resonance modes of the second multimode resonator.

12. The method of claim 11 , wherein both the resonance frequencies of the first multimode resonator and the readout resonator frequencies of the first readout resonator range from about 5-15 GHz.

13. The method of claim 12 , wherein both the resonance frequencies of the second multimode resonator and the readout resonator frequencies of the second readout resonator range from about 5-15 GHz.

14. The method of claim 1 , wherein the multimode Josephson parametric converter comprises a first port and a second port.

15. The method of claim 14 , wherein the first port is configured to receive input of the first group of readout signals resonant with the resonance modes of the first multimode.

16. The method of claim 14 , wherein the second port is configured to receive input of the second group of readout signals resonant with the resonance modes of the second multimode resonator.

17. The method of claim 14 , wherein the first port or the second port is configured to receive input of the pump signals.

18. The method of claim 14 , wherein the first port and the second port are each connectable to a 180 degree hybrid coupler.

19. The method of claim 1 , wherein the multimode Josephson parametric converter comprises a multimode Josephson ring modulator.

20. The method of claim 19 , wherein the multimode Josephson ring modulator is a nonlinear dispersive element based comprising Josephson junctions.

Assignees

• IBM

Inventors

• Abdo Baleegh

Classifications

• H01L39/223

  Electricity · mapped topic

• H03F19/00

  Amplifiers using superconductivity effects · CPC title

• H01P5/12

  Coupling devices having more than two ports (H01P5/04 takes precedence) · CPC title

• H03K3/38 Primary

  by the use, as active elements, of superconductive devices · CPC title

• H01P1/38

  Circulators · CPC title