Modular quantum interconnect for microwave and telecommunications wavelengths
A quantum interconnect module includes a quantum memory that has a dual arm interferometer embedded therein. The dual arm interferometer has a first arm within a crystal and a second arm within the crystal. The interferometer is coupled to a photon source. A microwave resonator has a waveguide coupled to a microwave source. The microwave resonator is coupled to the first arm of the quantum memory. The interferometer generates an output based on the microwave source.
1. A quantum interconnect module comprising:
a quantum memory comprising a dual arm interferometer embedded therein, said dual arm interferometer comprising a first arm within a crystal and a second arm within the crystal, said interferometer coupled to a photon source;
a microwave resonator comprising a waveguide coupled to a microwave source, said microwave resonator coupled to the first arm of the quantum memory; and
said interferometer generating an output based the microwave source.
2. The quantum interconnect module of claim 1 wherein the crystal comprises a rare earth ion crystal.
3. The quantum interconnect module of claim 1 wherein the waveguide is deposited onto the crystal.
4. The quantum interconnect module of claim 1 wherein the crystal is deposited on a first substrate and the waveguide is formed on a second substrate separate from the first substrate.
5. The quantum interconnect module of claim 1 wherein the waveguide comprises a superconducting waveguide.
6. The quantum interconnect module of claim 1 wherein the microwave resonator comprises a coplanar waveguide microwave resonator.
7. The quantum interconnect module of claim 1 wherein the microwave resonator comprises a macroscopic loop-gap resonator.
8. The quantum interconnect module of claim 1 wherein the crystal comprises rare earth ions having half-integer spin.
9. The quantum interconnect module of claim 1 wherein the crystal comprises Erbium ions.
10. The quantum interconnect module of claim 1 wherein the crystal comprises Kramer-type ions.
11. The quantum interconnect module of claim 1 wherein the photon source comprises a telecom photon source.
12. A quantum interconnect system comprising:
a first quantum interconnect module of claim 1 comprising a first output, said first quantum module associated with a first quantum computer;
a second quantum interconnect module of claim 1 comprising a second output, said second quantum module associated with a second quantum computer;
a detector converting the first output to a first electrical signal and the second output to a second electrical signal; and
a Bell state analyzer entangling the first quantum computer and the second quantum computer based on the first electrical signal and the second electrical signal.
13. The quantum interconnect system of claim 12 wherein the Bell state analyzer entangles the first quantum computer and the second quantum computer based on a Bell measurement using a specific sequence of photon detection events from the first electrical signal and the second electrical signal.
14. A method comprising:
communicating a first photon into a first quantum memory having a first dual arm interferometer, said first dual arm interferometer comprising a first arm and a second arm formed within a crystal; and
controlling a first microwave resonator comprising a first waveguide coupled to a first microwave source and the first arm of the quantum memory,
generating a first output at the first interferometer based on the first microwave source.
15. The method of claim 14 wherein controlling the first resonator comprises controlling the first resonator by applying a microwave photon thereto to form a conditional phase shift in the first arm.
16. The method of claim 14 further comprising communicating a second photon into a second quantum memory having a second dual arm interferometer, said second dual arm interferometer comprising a third arm and a fourth arm formed within a second crystal;
controlling a second microwave resonator comprising a second waveguide coupled to a second microwave source and the third arm of the second interferometer; and
generating a second output at the second interferometer based controlling the second microwave resonator.
17. The method of claim 16 further comprising generating a Bell measurement based on the first output and the second output.
18. The method of claim 17 further comprising entangling a first quantum computer associated with the first quantum memory and a second quantum computer associated with the second quantum memory based on the Bell measurement.
19. The method of claim 18 wherein communicating the first photon comprises communicating the first photon from a first telecom source and communicating the second photon comprises communicating the second photon from a second telecom source.