Quantum repeater using atomic cascade transitions
First Claim
1. A quantum communications repeater comprising:
- means for producing an entangled pair of photons comprising a first photon configured for long-distance quantum communications and a second photon configured for mapping into a storage element;
means for mapping the second photon into the storage element; and
means for transmitting a signal corresponding to the first photon over an optical fiber.
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Abstract
Via atomic cascade emission, an entangled pair of photons may be generated. A first one of the entangled pair may be ideal for long-distance communication. The other one may be suited for mapping to a long-lived atomic memory. Also, a deterministic single photon may be produced using a feedback system. If the feedback system indicates that an excitation exists in an atomic ensemble, then the atomic ensemble may be hit with a laser to produce the deterministic single photon. Furthermore, gas in the atomic ensemble may be subdivided into independent elements each of which may function as a memory element itself. In addition, dual species matter qubits may be entangled with light. A volume in an atomic ensemble may comprise a first isotope vapor storing a first state of a qubit. The volume may also comprise a second isotope vapor configured to store a second state of the qubit.
43 Citations
20 Claims
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1. A quantum communications repeater comprising:
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means for producing an entangled pair of photons comprising a first photon configured for long-distance quantum communications and a second photon configured for mapping into a storage element; means for mapping the second photon into the storage element; and means for transmitting a signal corresponding to the first photon over an optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for providing a deterministic single photon, the method comprising:
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determining that an excitation is present in an atomic ensemble; hitting, when it is determined that the excitation is present in the atomic ensemble, the atomic ensemble with a first laser; and collecting the single photon in response to hitting the atomic ensemble with the first laser. - View Dependent Claims (11, 12, 13)
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14. A system for providing a deterministic single photon, the system comprising:
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means for determining that an excitation is present in an atomic ensemble; means for hitting, when it is determined that the excitation is present in the atomic ensemble, the atomic ensemble with a first laser; and means for collecting the single photon in response to hitting the atomic ensemble with the first laser. - View Dependent Claims (15, 16, 17)
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18. A multiplexed quantum repeater network comprising:
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terminal nodes; a plurality of internal nodes each comprising a pair of quantum memory sites wherein all quantum memory sites comprise a plurality of independent memory elements; and means for sequentially scanning all of the quantum memory sites within at least one of the internal nodes to connect any available memory elements within a scanned memory site.
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19. A storage element comprising:
an atomic ensemble having a volume, the volume comprising, a first isotope vapor configured to store a first state of a first qubit, and a second isotope vapor configured to store a second state of the first qubit. - View Dependent Claims (20)
Specification