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Masato Koashi - One of the best experts on this subject based on the ideXlab platform.

  • experimental quantum key distribution without Monitoring Signal disturbance
    Nature Photonics, 2015
    Co-Authors: Hiroki Takesue, Toshihiko Sasaki, Kiyoshi Tamaki, Masato Koashi
    Abstract:

    A proof-of-principle quantum key distribution experiment based on the round-robin differential phase shift protocol is demonstrated. Using a coherent wave-packet containing five pulses, the quantum keys were distributed over up to 30 km of fibre.

  • practical quantum key distribution protocol without Monitoring Signal disturbance
    Nature, 2014
    Co-Authors: Toshihiko Sasaki, Yoshihisa Yamamoto, Masato Koashi
    Abstract:

    Conventional quantum cryptography relies on Monitoring Signal disturbance to make sure that information leakage is negligible; here a new quantum method of achieving security is described, in which little information is leaked to the eavesdropper regardless of the Signal disturbance. In quantum cryptography, two parties can exchange information encoded in quantum states privately because any attempt to listen in will cause a detectable disturbance that correlates with the amount of information that is intercepted. Part of the exchanged information has to be sacrificed however, and used to estimate any possible eavesdropping. This compromise sets a limit to the efficiency with which information can be exchanged securely. Masato Koashi and colleagues demonstrate a new approach that dispenses with this last step. The protocol works by spreading quantum information over hundreds of quantum systems using laser pulses. An eavesdropper can intercept a few bits, but the inherent randomness makes it near-impossible to determine the key. The use of conventional lasers and elimination of security Monitoring costs could make the approach highly practical. Quantum cryptography1,2,3,4,5,6,7,8 exploits the fundamental laws of quantum mechanics to provide a secure way to exchange private information. Such an exchange requires a common random bit sequence, called a key, to be shared secretly between the sender and the receiver. The basic idea behind quantum key distribution (QKD) has widely been understood as the property that any attempt to distinguish encoded quantum states causes a disturbance in the Signal. As a result, implementation of a QKD protocol involves an estimation of the experimental parameters influenced by the eavesdropper’s intervention, which is achieved by randomly sampling the Signal. If the estimation of many parameters with high precision is required, the portion of the Signal that is sacrificed increases, thus decreasing the efficiency of the protocol9,10. Here we propose a QKD protocol based on an entirely different principle. The sender encodes a bit sequence onto non-orthogonal quantum states and the receiver randomly dictates how a single bit should be calculated from the sequence. The eavesdropper, who is unable to learn the whole of the sequence, cannot guess the bit value correctly. An achievable rate of secure key distribution is calculated by considering complementary choices between quantum measurements of two conjugate observables11. We found that a practical implementation using a laser pulse train achieves a key rate comparable to a decoy-state QKD protocol12,13,14, an often-used technique for lasers. It also has a better tolerance of bit errors and of finite-sized-key effects. We anticipate that this finding will give new insight into how the probabilistic nature of quantum mechanics can be related to secure communication, and will facilitate the simple and efficient use of conventional lasers for QKD.

  • Practical quantum key distribution protocol without Monitoring Signal disturbance
    Nature, 2014
    Co-Authors: Toshihiko Sasaki, Yoshihisa Yamamoto, Masato Koashi
    Abstract:

    Quantum cryptography exploits the fundamental laws of quan- tummechanics to provide a securewayto exchangeprivate informa- tion. Such an exchange requires a common random bit sequence, calleda key, tobesharedsecretly betweenthe senderandthe receiver. The basic idea behind quantum key distribution (QKD) has widely been understood as the property that any attempt to distinguish encodedquantumstates causes a disturbance inthe Signal.As a result, implementation of a QKD protocol involves an estimation of the experimental parameters influenced by the eavesdropper’s inter- vention, which is achieved by randomly sampling the Signal. If the estimation of many parameters with high precision is required, the portion of the Signal that is sacrificed increases, thus decreasing the efficiency of the protocol9,10 .HereweproposeaQKDprotocol based onan entirely different principle. Thesender encodes a bit sequence ontonon-orthogonal quantumstatesand the receiver randomly dic- tates how a single bit should be calculated from the sequence. The eavesdropper,whois unable to learn the whole of the sequence, can- notguess the bit value correctly.Anachievable rate of secure keydis- tribution is calculatedbyconsideringcomplementarychoicesbetween quantum measurements of two conjugate observables11 . We found that a practical implementation using a laser pulse train achieves a key rate comparable to a decoy-state QKD protocol12–14 , an often- used technique for lasers. It also has a better tolerance of bit errors andof finite-sized-key effects.We anticipate that this findingwill give newinsight into how the probabilistic nature of quantummechanics can be related to securecommunication, and will facilitate the simple and efficient use of conventional lasers for QKD.

Toshihiko Sasaki - One of the best experts on this subject based on the ideXlab platform.

  • experimental quantum key distribution without Monitoring Signal disturbance
    Nature Photonics, 2015
    Co-Authors: Hiroki Takesue, Toshihiko Sasaki, Kiyoshi Tamaki, Masato Koashi
    Abstract:

    A proof-of-principle quantum key distribution experiment based on the round-robin differential phase shift protocol is demonstrated. Using a coherent wave-packet containing five pulses, the quantum keys were distributed over up to 30 km of fibre.

  • practical quantum key distribution protocol without Monitoring Signal disturbance
    Nature, 2014
    Co-Authors: Toshihiko Sasaki, Yoshihisa Yamamoto, Masato Koashi
    Abstract:

    Conventional quantum cryptography relies on Monitoring Signal disturbance to make sure that information leakage is negligible; here a new quantum method of achieving security is described, in which little information is leaked to the eavesdropper regardless of the Signal disturbance. In quantum cryptography, two parties can exchange information encoded in quantum states privately because any attempt to listen in will cause a detectable disturbance that correlates with the amount of information that is intercepted. Part of the exchanged information has to be sacrificed however, and used to estimate any possible eavesdropping. This compromise sets a limit to the efficiency with which information can be exchanged securely. Masato Koashi and colleagues demonstrate a new approach that dispenses with this last step. The protocol works by spreading quantum information over hundreds of quantum systems using laser pulses. An eavesdropper can intercept a few bits, but the inherent randomness makes it near-impossible to determine the key. The use of conventional lasers and elimination of security Monitoring costs could make the approach highly practical. Quantum cryptography1,2,3,4,5,6,7,8 exploits the fundamental laws of quantum mechanics to provide a secure way to exchange private information. Such an exchange requires a common random bit sequence, called a key, to be shared secretly between the sender and the receiver. The basic idea behind quantum key distribution (QKD) has widely been understood as the property that any attempt to distinguish encoded quantum states causes a disturbance in the Signal. As a result, implementation of a QKD protocol involves an estimation of the experimental parameters influenced by the eavesdropper’s intervention, which is achieved by randomly sampling the Signal. If the estimation of many parameters with high precision is required, the portion of the Signal that is sacrificed increases, thus decreasing the efficiency of the protocol9,10. Here we propose a QKD protocol based on an entirely different principle. The sender encodes a bit sequence onto non-orthogonal quantum states and the receiver randomly dictates how a single bit should be calculated from the sequence. The eavesdropper, who is unable to learn the whole of the sequence, cannot guess the bit value correctly. An achievable rate of secure key distribution is calculated by considering complementary choices between quantum measurements of two conjugate observables11. We found that a practical implementation using a laser pulse train achieves a key rate comparable to a decoy-state QKD protocol12,13,14, an often-used technique for lasers. It also has a better tolerance of bit errors and of finite-sized-key effects. We anticipate that this finding will give new insight into how the probabilistic nature of quantum mechanics can be related to secure communication, and will facilitate the simple and efficient use of conventional lasers for QKD.

  • Practical quantum key distribution protocol without Monitoring Signal disturbance
    Nature, 2014
    Co-Authors: Toshihiko Sasaki, Yoshihisa Yamamoto, Masato Koashi
    Abstract:

    Quantum cryptography exploits the fundamental laws of quan- tummechanics to provide a securewayto exchangeprivate informa- tion. Such an exchange requires a common random bit sequence, calleda key, tobesharedsecretly betweenthe senderandthe receiver. The basic idea behind quantum key distribution (QKD) has widely been understood as the property that any attempt to distinguish encodedquantumstates causes a disturbance inthe Signal.As a result, implementation of a QKD protocol involves an estimation of the experimental parameters influenced by the eavesdropper’s inter- vention, which is achieved by randomly sampling the Signal. If the estimation of many parameters with high precision is required, the portion of the Signal that is sacrificed increases, thus decreasing the efficiency of the protocol9,10 .HereweproposeaQKDprotocol based onan entirely different principle. Thesender encodes a bit sequence ontonon-orthogonal quantumstatesand the receiver randomly dic- tates how a single bit should be calculated from the sequence. The eavesdropper,whois unable to learn the whole of the sequence, can- notguess the bit value correctly.Anachievable rate of secure keydis- tribution is calculatedbyconsideringcomplementarychoicesbetween quantum measurements of two conjugate observables11 . We found that a practical implementation using a laser pulse train achieves a key rate comparable to a decoy-state QKD protocol12–14 , an often- used technique for lasers. It also has a better tolerance of bit errors andof finite-sized-key effects.We anticipate that this findingwill give newinsight into how the probabilistic nature of quantummechanics can be related to securecommunication, and will facilitate the simple and efficient use of conventional lasers for QKD.

Yoshihisa Yamamoto - One of the best experts on this subject based on the ideXlab platform.

  • practical quantum key distribution protocol without Monitoring Signal disturbance
    Nature, 2014
    Co-Authors: Toshihiko Sasaki, Yoshihisa Yamamoto, Masato Koashi
    Abstract:

    Conventional quantum cryptography relies on Monitoring Signal disturbance to make sure that information leakage is negligible; here a new quantum method of achieving security is described, in which little information is leaked to the eavesdropper regardless of the Signal disturbance. In quantum cryptography, two parties can exchange information encoded in quantum states privately because any attempt to listen in will cause a detectable disturbance that correlates with the amount of information that is intercepted. Part of the exchanged information has to be sacrificed however, and used to estimate any possible eavesdropping. This compromise sets a limit to the efficiency with which information can be exchanged securely. Masato Koashi and colleagues demonstrate a new approach that dispenses with this last step. The protocol works by spreading quantum information over hundreds of quantum systems using laser pulses. An eavesdropper can intercept a few bits, but the inherent randomness makes it near-impossible to determine the key. The use of conventional lasers and elimination of security Monitoring costs could make the approach highly practical. Quantum cryptography1,2,3,4,5,6,7,8 exploits the fundamental laws of quantum mechanics to provide a secure way to exchange private information. Such an exchange requires a common random bit sequence, called a key, to be shared secretly between the sender and the receiver. The basic idea behind quantum key distribution (QKD) has widely been understood as the property that any attempt to distinguish encoded quantum states causes a disturbance in the Signal. As a result, implementation of a QKD protocol involves an estimation of the experimental parameters influenced by the eavesdropper’s intervention, which is achieved by randomly sampling the Signal. If the estimation of many parameters with high precision is required, the portion of the Signal that is sacrificed increases, thus decreasing the efficiency of the protocol9,10. Here we propose a QKD protocol based on an entirely different principle. The sender encodes a bit sequence onto non-orthogonal quantum states and the receiver randomly dictates how a single bit should be calculated from the sequence. The eavesdropper, who is unable to learn the whole of the sequence, cannot guess the bit value correctly. An achievable rate of secure key distribution is calculated by considering complementary choices between quantum measurements of two conjugate observables11. We found that a practical implementation using a laser pulse train achieves a key rate comparable to a decoy-state QKD protocol12,13,14, an often-used technique for lasers. It also has a better tolerance of bit errors and of finite-sized-key effects. We anticipate that this finding will give new insight into how the probabilistic nature of quantum mechanics can be related to secure communication, and will facilitate the simple and efficient use of conventional lasers for QKD.

  • Practical quantum key distribution protocol without Monitoring Signal disturbance
    Nature, 2014
    Co-Authors: Toshihiko Sasaki, Yoshihisa Yamamoto, Masato Koashi
    Abstract:

    Quantum cryptography exploits the fundamental laws of quan- tummechanics to provide a securewayto exchangeprivate informa- tion. Such an exchange requires a common random bit sequence, calleda key, tobesharedsecretly betweenthe senderandthe receiver. The basic idea behind quantum key distribution (QKD) has widely been understood as the property that any attempt to distinguish encodedquantumstates causes a disturbance inthe Signal.As a result, implementation of a QKD protocol involves an estimation of the experimental parameters influenced by the eavesdropper’s inter- vention, which is achieved by randomly sampling the Signal. If the estimation of many parameters with high precision is required, the portion of the Signal that is sacrificed increases, thus decreasing the efficiency of the protocol9,10 .HereweproposeaQKDprotocol based onan entirely different principle. Thesender encodes a bit sequence ontonon-orthogonal quantumstatesand the receiver randomly dic- tates how a single bit should be calculated from the sequence. The eavesdropper,whois unable to learn the whole of the sequence, can- notguess the bit value correctly.Anachievable rate of secure keydis- tribution is calculatedbyconsideringcomplementarychoicesbetween quantum measurements of two conjugate observables11 . We found that a practical implementation using a laser pulse train achieves a key rate comparable to a decoy-state QKD protocol12–14 , an often- used technique for lasers. It also has a better tolerance of bit errors andof finite-sized-key effects.We anticipate that this findingwill give newinsight into how the probabilistic nature of quantummechanics can be related to securecommunication, and will facilitate the simple and efficient use of conventional lasers for QKD.

Hiroki Takesue - One of the best experts on this subject based on the ideXlab platform.

Kiyoshi Tamaki - One of the best experts on this subject based on the ideXlab platform.