Photonic quantum computation with dirty photons
Systems and methods for generating photonic graph states for quantum computing include coupling a quantum emitter to a cavity, generating a first dirty photon having a first temporal profile, using the first dirty photon to form a first photonic qubit, generating a second dirty photon having a second temporal profile, using the second dirty photon to form a second photonic qubit, using the quantum emitter coupled to the cavity to entangle the first photonic qubit with the second photonic qubit to form a pair of entangled photonic qubits, and using the pair of entangled photonic qubits for quantum computation.
1. A method of generating photonic graph states for quantum computing, the method comprising:
coupling a quantum emitter to a cavity;
generating a first dirty photon having a first temporal profile;
using the first dirty photon to form a first photonic qubit;
generating a second dirty photon having a second temporal profile;
using the second dirty photon to form a second photonic qubit;
using the quantum emitter coupled to the cavity to entangle the first photonic qubit with the second photonic qubit to form a pair of entangled photonic qubits; and
using the pair of entangled photonic qubits for quantum computation.
2. The method of claim 1 , wherein the method further comprises using the cavity coupled to the quantum emitter to entangle a plurality of additional photons to generate a photonic graph.
3. The method of claim 2 , wherein at least some of the additional photons are dirty.
4. The method of claim 1 , further comprising:
generating a third dirty photon having a third temporal profile different from the first and second temporal profiles;
using the third dirty photon to form a third photonic qubit;
using the quantum emitter coupled to the cavity to entangle the third photonic qubit with the first or second photonic qubit, to form three entangled photonic qubits; and
wherein the using the pair of entangled photonic qubits for quantum computation includes using the three entangled photonic qubits for quantum computation.
5. The method of claim 1 , wherein the first dirty photon and the second dirty photon are generated by extraction from a coherent laser pulse using a quantum emitter coupled to a cavity.
6. The method of claim 1 , wherein the first dirty photon and the second dirty photon are each part of a graph, and wherein the graph contains photonic qubits lacking quantum emitter qubits, or photonic and quantum emitter qubits.
7. The method of claim 1 , wherein at least one of the first dirty photon and the second dirty photon are obtained from an optical delay line.
8. The method of claim 1 , wherein spectra of the first dirty photon and the second dirty photon are within an interaction bandwidth of the quantum emitter coupled to the cavity.
9. The method of claim 1 , wherein at least one of the first dirty photon and the second dirty photon are generated from a fluctuating quantum emitter.
10. The method of claim 1 , wherein the quantum emitter includes a stationary qubit capable of interacting with photons.
11. The method of claim 1 , wherein the quantum emitter includes a superconducting qubit.
12. The method of claim 1 , wherein the quantum emitter includes a quantum dot.
13. The method of claim 1 , wherein the quantum emitter includes at least one of an atom or an ion.
14. The method of claim 13 , wherein the atom or the ion is sourced from rubidium.
15. The method of claim 13 , the atom or the ion is sourced from cesium.
16. The method of claim 13 , wherein the quantum emitter includes at least one of Strontium, Erbium, Ytterbium, Calcium, Barium, Beryllium, or Magnesium atom.
17. The method of claim 1 , wherein the second temporal profile is different from the first temporal profile.
18. The method of claim 1 , wherein the second temporal profile is the same as the first temporal profile.
19. A system for generating photonic graph states for quantum computing, the system comprising:
a cavity;
a quantum emitter couplable to the cavity;
a photon generator configured to generate dirty photons; and
circuitry configured to:
couple the quantum emitter to the cavity;
control the photon generator to generate a first dirty photon having a first temporal profile;
use the first dirty photon to form a first photonic qubit;
control the photon generator to generate a second dirty photon having a second temporal profile;
use the second dirty photon to form a second photonic qubit;
use the quantum emitter coupled to the cavity to entangle the first photonic qubit with the second photonic qubit to form a pair of entangled photonic qubits; and
use the pair of entangled photonic qubits for quantum computation.
20. A non-transitory computer-readable storage medium including instructions that, when executed by at least one processor, cause the at least one processor to carry out a method of generating photonic graph states for quantum computing, comprising:
coupling a quantum emitter to a cavity;
generating a first dirty photon having a first temporal profile;
using the first dirty photon to form a first photonic qubit;
generating a second dirty photon having a second temporal profile;
using the second dirty photon to form a second photonic qubit;
using the quantum emitter coupled to the cavity to entangle the first photonic qubit with the second photonic qubit to form a pair of entangled photonic qubits; and
using the pair of entangled photonic qubits for quantum computation.