Abstract
We present an experimental realization of a quantum digital signature protocol which, together with a standard quantum key distribution link, increases transmission distance to kilometre ranges, three orders of magnitude larger than in previous realizations. The bit-rate is also significantly increased compared with previous quantum signature demonstrations. This work illustrates that quantum digital signatures can be realized with optical components similar to those used for quantum key distribution, and could be implemented in existing optical fiber networks.
Highlights
Signature schemes are widely used in electronic communication to guarantee the authenticity and transferability of messages
We present an experimental realization of a quantum digital signature protocol which, together with a standard quantum key distribution link, increases transmission distance to kilometer ranges, three orders of magnitude larger than in previous realizations
Removing the cumbersome multiport of previous QDS hardware iterations means that this test bed exhibits significantly enhanced robustness against environmental disturbances while simultaneously highlighting a pathway to implementation of QDS with QKD hardware
Summary
Signature schemes are widely used in electronic communication to guarantee the authenticity and transferability of messages. Transferability means that a signed message is unlikely to be accepted by one recipient and, if forwarded, subsequently rejected by another recipient [1]. This property distinguishes signature schemes from message authentication schemes, which do not guarantee transferability. Since the security of public-key schemes is not information theoretic but relies on computational assumptions, it can be retrospectively affected by future advances in technology or the discovery of efficient algorithms. All of the above schemes are known to be insecure against an adversary with a quantum computer [5]
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