Quantum Anonymous Transmissions

Details Quantum Anonymous Transmissions Quantum Anonymous Transmissions

2004-09-28

arxiv.org/abs/quant-ph/0409201v2

Proc. of 11th ASIACRYPT, 2005, LNCS 3788, pages 217-235.

Physics

Quantum Physics

18 pages, LaTeX. Substantially updated version. To appear at ASIACRYPT '05

Scientific paper

10.1007/11593447_12

We consider the problem of hiding sender and receiver of classical and quantum bits (qubits), even if all physical transmissions can be monitored. We present a quantum protocol for sending and receiving classical bits anonymously, which is completely traceless: it successfully prevents later reconstruction of the sender. We show that this is not possible classically. It appears that entangled quantum states are uniquely suited for traceless anonymous transmissions. We then extend this protocol to send and receive qubits anonymously. In the process we introduce a new primitive called anonymous entanglement, which may be useful in other contexts as well.

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