Key rate of quantum key distribution with hashed two-way classical communication

Watanabe, Shun; Matsumoto, Ryutaroh; Uyematsu, Tomohiko; Kawano, Yasuhito

doi:10.1103/physreva.76.032312

Cited by 48 publications

(57 citation statements)

References 34 publications

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“…As for the security of this poslselection approach as applied to a QKD system, no advantage is given to a potential attacker in the true single-photon regime, since the thresholding is nothing but a further sifting step on the received bits [21,23]. If the attacker tried to force Alice and Bob to postselect a particular bit, in fact, she would alter the probe signal before the disclosure of the preparation bases on the public channel, and, therefore, before she could actually know if her measured bit is correct.…”

Section: Realization Of the Arts Methodsmentioning

confidence: 99%

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Adaptive real time selection for quantum key distribution in lossy and turbulent free-space channels

et al. 2015

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The unconditional security in the creation of cryptographic keys obtained by quantum key distribution (QKD) protocols will induce a quantum leap in free-space communication privacy in the same way that we are beginning to realize secure optical fiber connections. However, free-space channels, in particular those with long links and the presence of atmospheric turbulence, are affected by losses, fluctuating transmissivity, and background light that impair the conditions for secure QKD. Here we introduce a method to contrast the atmospheric turbulence in QKD experiments. Our adaptive real time selection (ARTS) technique at the receiver is based on the selection of the intervals with higher channel transmissivity. We demonstrate, using data from the Canary Island 143-km free-space link, that conditions with unacceptable average quantum bit error rate which would prevent the generation of a secure key can be used once parsed according to the instantaneous scintillation using the ARTS technique

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Section: Realization Of the Arts Methodsmentioning

confidence: 99%

“…[22] was proposed in Ref. [23]: parities for many pairs of bits are shared between Alice and Bob along the public channel. Those pairs with nonmatching parities are discarded, while the remaining ones (over which the QBER is lower) are syndrome decoded.…”

Section: Introductionmentioning

confidence: 99%

Adaptive real time selection for quantum key distribution in lossy and turbulent free-space channels

et al. 2015

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“…see [9,Section 2]). Note that we do not use the so-called noisy preprocessing [10], [11] nor the postprocessing with two-way classical communication [12], [13]. n (see [9]).…”

Section: A Stokes Parameterizationmentioning

confidence: 99%

“…The reason why we utilize the mismatched measurement outcomes is that the authors recently showed that the key generation rate is increased if we use the mismatched measurement outcomes [9]. In the postprocessing phase, we employ the standard postprocessing without the noisy preprocessing [10], [11] nor the two-way classical communication [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Optimal axis compensation in quantum key distribution protocols over unital channels

Watanabe

Matsumoto

Uyematsu

2009

2009 IEEE International Symposium on Information Theory

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The axis compensation is a procedure in which the sender and the receiver compensate the axes of their transmitter and detector so that the bit sequence can be transmitted more reliably. We show the optimal axis compensations maximizing the key generation rate. We consider the case in which only the receiver is allowed to compensate his axis, and the case in which both the sender and the receiver are allowed to compensate their axes. For unital channels, we clarify that the optimal key generation rates for both cases coincide if they utilize the mismatched measurement outcomes in the channel estimation. We also clarify that the optimal key generation rates for both cases do not coincide in general if they do not utilize the mismatched measurement outcomes in the channel estimation.978-1-4244-4313-0/09/$25.00 ©2009 IEEE

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“…We have chosen to restrict the channel to one-way communications since our focus is on practical protocols with reduced distillation complexity, network requirements, etc. However, it should be noted that two-way communications can be used to distill a key in scenarios where one-way secret key distillation is not possible [5] and, in general, the amount of a distillable secret key with two-way communications can be strictly higher than with one-way communications [22,23].…”

Section: A Impact Of Information Reconciliation On the Secret Key Lementioning

confidence: 99%

Analysis of a rate-adaptive reconciliation protocol and the effect of leakage on the secret key rate

2013

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Quantum key distribution performs the trick of growing a secret key in two distant places connected by a quantum channel. The main reason is so that the legitimate users can bound the information gathered by the eavesdropper. In practical systems, whether because of finite resources or external conditions, the quantum channel is subject to fluctuations. A rate-adaptive information reconciliation protocol, which adapts to the changes in the communication channel, is then required to minimize the leakage of information in the classical postprocessing. We consider here the leakage of a rate-adaptive information reconciliation protocol. The length of the exchanged messages is larger than that of an optimal protocol; however, we prove that the min-entropy reduction is limited. The simulation results, both in the asymptotic and in the finite-length regime, show that this protocol allows to increase the amount of a distillable secret key.

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Key rate of quantum key distribution with hashed two-way classical communication

Cited by 48 publications

References 34 publications

Adaptive real time selection for quantum key distribution in lossy and turbulent free-space channels

Adaptive real time selection for quantum key distribution in lossy and turbulent free-space channels

Optimal axis compensation in quantum key distribution protocols over unital channels

Analysis of a rate-adaptive reconciliation protocol and the effect of leakage on the secret key rate

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