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US 11,387,915 B2Granted
Dipole-coupled defects as entangled photon pair sources
AssigneePresident and Fellows of Harvard College
InventorsDerek S. Wang, Tomas Neuman, Prineha Narang
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Abstract
Devices comprising dipole-coupled defects for use as entangled photon pair sources are provided.
Claims14
A device, comprising:
- a substrate comprising at least a first and a second quantum emitters, said first and second quantum emitters forming a quantum system, the at least first and second quantum emitters being dipole-dipole coupled;
- and
- a coherent light source optically coupled to the substrate, wherein:
- each of the first and second quantum emitters has a ground state and at least a first and a second excited states, wherein the at least first and second excited states have transition dipole moments with respect to the ground state, said dipole moments being orthogonal, and
- the coherent light source is configured to prepare the quantum system in a state of symmetric superposition of two quantum states of the system:
- (i) a state in which the first quantum emitter is in the first excited state and the second quantum emitter is in the second excited state, and (ii) a state in which the first quantum emitter is in the second excited state and the second quantum emitter is in the first excited state.
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A method of producing entangled photon pairs, the method comprising:
- configuring a coherent light source to prepare a quantum system in a target quantum state,
- wherein the quantum system comprises a first and a second quantum emitters, each of the first and second quantum emitters having a ground state and at least a first and a second excited states having transition dipole moments with respect to the ground state, said dipole moments being orthogonal,
- wherein the target quantum state is a state of symmetric superposition of two quantum states of the system:
- (i) a state in which the first quantum emitter is in a first excited state and the second quantum emitter is in a second excited state, and (ii) a state in which the first quantum emitter is in a second excited state and the second quantum emitter is in a first excited state;
- and
- illuminating by the coherent light a substrate comprising the at least first and second quantum emitters, the at least first and second quantum emitters being dipole-dipole coupled.
3 more elements
Dependencies are inferred from the claim text.