OPTICAL PHASE MODULATION METHOD AND APPARATUS FOR QUANTUM KEY DISTRIBUTION
First Claim
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1. A transmitting apparatus of a quantum key distribution system, the transmitting apparatus comprising:
- an optical interferometer to receive a single photon inputted from a light source, and to divide a path into a plurality of paths to enable a probability of existence of the inputted single photon to be distributed in a plurality of coordinates in a time domain; and
an optical phase modulator being connected to an outside of the optical interferometer, and modulating a phase of a single photon corresponding to at least one path from among the plurality of paths.
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Abstract
Provided is an optical phase modulating method and apparatus for a quantum key distribution. When an optical phase modulator is arranged outside an optical interferometer, a configuration of the optical interferometer may be simplified, and an extension of an optical path caused by the optical phase modulator, instability and an insertion loss increased in the optical interferometer, and the like, may be overcome. An output feature may be improved by adjusting an applied voltage of the optical phase modulator arranged outside the optical interferometer.
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Citations
20 Claims
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1. A transmitting apparatus of a quantum key distribution system, the transmitting apparatus comprising:
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an optical interferometer to receive a single photon inputted from a light source, and to divide a path into a plurality of paths to enable a probability of existence of the inputted single photon to be distributed in a plurality of coordinates in a time domain; and an optical phase modulator being connected to an outside of the optical interferometer, and modulating a phase of a single photon corresponding to at least one path from among the plurality of paths. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiving apparatus of a quantum key distribution system, the receiving apparatus comprising:
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an optical phase modulator to receive a single photon from a transmitting apparatus of a quantum key distribution system, and to modulate a phase of a single photon that is not modulated from the received single photon; and an optical interferometer to divide a path of the single photon received from the optical phase modulator to enable a probability of existence of the single photon received from the optical phase modulator to be distributed in a plurality of coordinates in a time domain, wherein the optical phase modulator is connected to an outside of the optical interferometer. - View Dependent Claims (9, 10, 11, 12)
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13. A quantum key distribution system, the system comprising:
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a transmitting-end optical phase modulating unit including an optical phase modulator to input, with respect to a single photon, a modulation signal of which a time and a width is adjusted, a path of the single photon being divided into a plurality of paths to enable a probability of existence of the single photon to be distributed in a plurality of different coordinates, and to selectively modulate a phase of a single photon corresponding to at least one path from among the plurality of paths; and a receiving-end optical phase modulating unit to selectively modulate a phase of a single photon that is not modulated by the transmitting-end optical phase modulating unit from the single photon received via the transmitting-end optical phase modulating unit. - View Dependent Claims (14, 15, 16, 17)
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18. A transmitting method of a quantum key distribution system, the method comprising:
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receiving a single photon inputted from a light source; performing an optical interfering process that divides a path of the single photon into a plurality of paths to enable a probability of an existence of the single photon to be distributed in a plurality of coordinates in a time domain; and performing an optical modulating process that modulates a phase of a single photon corresponding to at least one path from among the plurality of paths, outside an apparatus where the optical interfering process is performed.
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19. A receiving method of a quantum key distribution system, the receiving method comprising:
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performing an optical phase modulating process that receives a single photon transmitted via a transmitting-end, and modulates a phase of a single photon that is not modulated from the received single photon; and performing an optical interfering process that divides a probability of existence of the optical phase modulated-single photon to be distributed, with a plurality of different probabilities, in a time domain, wherein optical modulating process is performed separately from the optical interfering process.
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20. An optical phase modulating method of a quantum key distribution system, the method comprising:
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a transmitting-end optical phase modulating process of inputting, with respect to a single photon, a modulation signal of which a time and a width is adjusted, a path of the single photon being divided into a plurality of paths to enable a probability of existence of the single photon to be distributed in a plurality of different coordinates, and of selectively modulating a phase of a single photon corresponding to at least one path from among the plurality of paths; and a receiving-end optical phase modulating process of selectively modulating a phase of a single photon that is not modulated by the transmitting-end optical phase modulating process from the single photon received via the transmitting-end optical phase modulating process.
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Specification