Quantum tomographic cryptography with Bell diagonal states: Nonequivalence of classical and quantum distillation protocols

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.012309· OSTI ID:20650191

Kaszlikowski, Dagomir; Lim, J Y; Willeboordse, Frederick H ^[1]; Oi, D K.L. ^[2]; Gopinathan, Ajay ^[1]; Kwek, L C ^[3]

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1. Department of Physics, National University of Singapore, Singapore 117 542 (Singapore)
2. Centre for Quantum Computation, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA (United Kingdom)
3. National Institute of Education, Nanyang Technological University, Singapore 639 798 (Singapore)

We present a generalized tomographic quantum key distribution protocol in which the two parties share a Bell diagonal mixed state of two qubits. We show that if an eavesdropper performs a coherent measurement on many quantum ancilla states simultaneously, classical methods of secure key distillation are less effective than quantum entanglement distillation protocols. We also show that certain classes of Bell diagonal states are resistant to any attempt at incoherent eavesdropping.

• OSTI ID: 20650191
• Journal Information: Physical Review. A, Vol. 71, Issue 1; Other Information: DOI: 10.1103/PhysRevA.71.012309; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CORRELATIONS
DATA TRANSMISSION
DISTRIBUTION
ENERGY LEVELS
MIXED STATE
QUANTUM MECHANICS
QUANTUM NUMBERS
SECRECY PROTECTION