On the Distinguishability of Relativistic Quantum States in Quantum Cryptography

Details On the Distinguishability of Relativistic Quantum States in Quantum Cryptography On the Distinguishability of Relativistic Quantum States in Quantum Cryptography

2000-06-02

arxiv.org/abs/quant-ph/0006010v1

Physics

Quantum Physics

13 pages, 1 figure

Scientific paper

Relativistic quantum field theory imposes additional fundamental restrictions on the distinguishability of quantum states. Because of the unavoidable delocalization of the quantum field states in the Minkowski space-time, the reliable (with unit probability) distinguishability of orthogonal states formally requires infinite time. For the cryptographic protocols which are finite in time the latter means that the effective ``noise'' is present even in the ideal communication channel because of the non-localizability of the quantum field states.

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