2016
DOI: 10.1364/ol.41.004883
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Experimental transmission of quantum digital signatures over 90  km of installed optical fiber using a differential phase shift quantum key distribution system

Abstract: Quantum digital signatures apply quantum mechanics to the problem of guaranteeing message integrity and nonrepudiation with information-theoretical security, which are complementary to the confidentiality realized by quantum key distribution. Previous experimental demonstrations have been limited to transmission distances of less than 5 km of optical fiber in a laboratory setting. Here we report the first demonstration of quantum digital signatures over installed optical fiber as well as the longest transmissi… Show more

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Cited by 62 publications
(55 citation statements)
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“…3, the experimental results of Refs. [17,22] are better than our theoretical signature rates at short distance, e.g., ¡ 100 km, which is attributed mainly to their high repetition rate. The security of differential-phase-shift protocol used in Refs.…”
Section: Introductioncontrasting
confidence: 76%
“…3, the experimental results of Refs. [17,22] are better than our theoretical signature rates at short distance, e.g., ¡ 100 km, which is attributed mainly to their high repetition rate. The security of differential-phase-shift protocol used in Refs.…”
Section: Introductioncontrasting
confidence: 76%
“…Successful operation has been shown over a combination of installed optical fiber and additional channel loss corresponding to 134.2 ± 3.8 km of installed optical fiber at two security levels, ε  = 10 −4 , as used in many previous demonstrations of QDS 11, 14, 16, 17 and ε  = 10 −10 , as commonly used in QKD systems. The performance of this system is enhanced compared to that reported previously over 90 km of installed optical fiber 20 in that it can now sign approximately 5 bits per second at 90 km for an ε of 10 −4 , as opposed to 2 bits per second previously, and 2 bits per second at an ε of 10 −10 , as opposed to 1. This is due to optimization of the bias voltage on the superconducting nanowire detectors.…”
Section: Resultsmentioning
confidence: 61%
“…The first demonstration of QDS over a free-space link was conducted over 1.6 km in an urban environment 17 using a continuous-variable free-space QKD implementation 18, 19 as the underlying system. The first experimental demonstration of QDS over installed optical fiber 20 was only conducted over one optical fiber transmission channel at a fixed distance of 90 km. Here, additional optical attenuation (in the form of a variable ND filter) has been combined with a fixed fiber length of 90 km to simulate extended transmission distances permitting operation to be demonstrated over a channel loss corresponding to 134 ± 3.8 km (assuming an overall 0.32 dB/km channel loss as exhibited by the installed optical fiber component) – the longest equivalent distance over which QDS has been shown to operate to date.…”
Section: Introductionmentioning
confidence: 99%
“…References [26,25] propose QDS protocols via insecure quantum channels, which later have been implemented [6,7]. A significant difference between these two protocols is the stage of quantum state distribution.…”
Section: Quantum Digital Signaturesmentioning
confidence: 99%
“…Inspired by the idea of QKD and taking advantage of QKD implementations, other quantum cryptographic primitives have gradually been developed, such as quantum coin tossing, quantum secret sharing (QSS), and quantum digital signatures (QDS) [2][3][4]. For each primitive, different protocols have been proposed, and even realized by current technology [5][6][7].…”
Section: General Introductionmentioning
confidence: 99%