Multimode josephson parametric converter: coupling josephson ring modlator to metamaterial

Patent metadata

Field	Value
Publication number	US-9985614-B2
Application number	US-201715443137-A
Country	US
Kind code	B2
Filing date	Feb 27, 2017
Priority date	Sep 30, 2015
Publication date	May 29, 2018
Grant date	May 29, 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 generating a bell state using photons as quantum bits, the method comprising:
providing a first multimode resonator and a second multimode resonator both connected to a dispersive nonlinear medium, wherein the first multimode resonator is a first left-handed transmission line and the second multimode resonator is a second left-handed transmission line, wherein resonance modes are identical in the first and second multimode resonators;
receiving, by the second multimode resonator, a pump signal at a frequency sum, the frequency sum is a summation of a resonance frequency of the resonance modes plus another resonance frequency of the resonance modes; and
in response to receiving the pump signal at the frequency sum, generating, by the dispersive nonlinear medium, a first photon and a second photon in a superposition of location states, the superposition of the location states for the first and second photons are related to being in the first multimode resonator and the second multimode resonator.

2. The method of claim 1 , wherein the superposition of the location states for the first photon is configured such that the first photon has an equal probability of being in the first multimode resonator or the second multimode resonator.

3. The method of claim 2 , wherein the superposition of the location states for the second photon is configured such that the second photon has an equal probability of being in the first multimode resonator or the second multimode resonator.

4. The method of claim 3 , wherein the first photon and the second photon are not both in a same one of the first and second multimode resonators.

5. The method of claim 1 , wherein the superposition of the location states for the first photon is configured such that the first photon has an equal probability of not being in the first multimode resonator or the second multimode resonator.

6. The method of claim 5 , wherein the superposition of the location states for the second photon is configured such that the second photon has an equal probability of not being in the first multimode resonator or the second multimode resonator.

7. The method of claim 1 , wherein the resonance modes of the first and second multimode resonators comprise a first resonance frequency, a second resonance frequency, through a last resonance frequency.

8. The method of claim 7 , wherein the resonance frequency is one of the first resonance frequency through the last resonance frequency.

9. The method of claim 8 , wherein the another resonance frequency is another one of the first resonance frequency through the last resonance frequency.

10. The method of claim 1 , wherein a multimode Josephson parametric converter is formed by the first multimode resonator, the second multimode resonator, and the dispersive nonlinear medium.

11. The method of claim 10 , wherein the multimode Josephson parametric converter is not configured to function as an amplifier.

12. The method of claim 10 , wherein the multimode Josephson parametric converter is configured to function as a single-photon downconverter.

13. The method of claim 12 , wherein the pump signal at the frequency sum is down converted into the first photon and the second photon.

14. The method of claim 10 , wherein the dispersive nonlinear medium is a multimode Josephson ring modulator.

15. The method of claim 14 , wherein the multimode Josephson ring modulator comprises Josephson junctions.

16. The method of claim 15 , wherein the Josephson junctions are connected in a ring.

17. The method of claim 10 , wherein the multimode Josephson parametric converter comprises a first port and a second port.

18. The method of claim 17 , wherein the first port or the second port is configured to receive input of the pump signal at the frequency sum.

19. The method of claim 17 , wherein the first port and the second port are each connectable to a 180 degree hybrid coupler.

20. The method of claim 1 , wherein the resonance modes range from about 5-15 GHz.

Assignees

• IBM

Inventors

• Abdo Baleegh

Classifications

• H01P1/38

  Circulators · CPC title

• H03H11/14

  using electro-optical devices · CPC title

• H01L39/025

  Electricity · mapped topic

• H01P5/02

  with invariable factor of coupling (H01P5/12 takes precedence {choke joints H01P1/04, H01P1/06}) · CPC title

• H01L39/223

  Electricity · mapped topic