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How far can one send a photon? |
Nicolas Gisin( ) |
| Group of Applied Physics, University of Geneva, 1211 Geneva 4, Switzerland |
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Abstract The answer to the question How far can one send a photon? depends heavily on what one means by a photon and on what one intends to do with that photon. For direct quantum communication, the limit is approximately 500 km. For terrestrial quantum communication, near-future technologies based on quantum teleportation and quantum memories will soon enable quantum repeaters that will turn the development of a world-wide-quantum-web (WWQW) into a highly non-trivial engineering problem. For Device-Independent Quantum Information Processing, near-future qubit amplifiers (i.e., probabilistic heralded amplification of the probability amplitude of the presence of photonic qubits) will soon allow demonstrations over a few tens of kilometers.
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| Keywords
quantum communication
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Corresponding Author(s):
Nicolas Gisin
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Online First Date: 09 November 2015
Issue Date: 28 December 2015
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There are quantum memories with longer storage times; however, they do not allow incoming photons to be s-tored. They either generate photons that are entangled with the quantum memory (hence, there are no read-write quantum memories, but read-only memories [10]), or they do not have any input-output [11].
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