Reduced randomness in quantum cryptography with sequences of qubits encoded in the same basis

Abstract

We consider the cloning of sequences of qubits prepared in the states used in the BB84 or 6-state quantum cryptography protocol, and show that the single-qubit fidelity is unaffected even if entire sequences of qubits are prepared in the same basis. This result is of great importance for practical quantum cryptosystems because it reduces the need for high-speed random number generation without impairing on the security against finite-size attacks.

8 pages, submitted to PRA

References in corpus (8)

• Quantum Cryptography
• Security of quantum key distribution using d-level systems
• Optimal eavesdropping in quantum cryptography with six states
• Incoherent and Coherent Eavesdropping in the 6-state Protocol of Quantum Cryptography
• Phase covariant quantum cloning
• Quantum cloning and the capacity of the Pauli channel
• Asymmetric quantum cloning machines in any dimension
• Mutually unbiased binary observable sets on N qubits

Cited by in corpus (5)

• Continuous variable quantum key distribution based on optical entangled states without signal modulation
• Entanglement-Enhanced Quantum Key Distribution
• Remote information concentration and multipartite entanglement in multilevel systems
• Optimal ancilla-free phase-covariant telecloning of qudits via nonmaximally entangled states
• Many-to-one remote information concentration for qudits and multipartite entanglement