Hiding bits in Bell states

Details Hiding bits in Bell states Hiding bits in Bell states

2000-11-10

arxiv.org/abs/quant-ph/0011042v3

Phys. Rev. Lett. 86, 5807--5810 (2001)

Physics

Quantum Physics

4 pages RevTex, 1 figure, various small changes and additional paragraph on optics implementation

Scientific paper

10.1103/PhysRevLett.86.5807

We present a scheme for hiding bits in Bell states that is secure even when the sharers Alice and Bob are allowed to carry out local quantum operations and classical communication. We prove that the information that Alice and Bob can gain about a hidden bit is exponentially small in $n$, the number of qubits in each share, and can be made arbitrarily small for hiding multiple bits. We indicate an alternative efficient low-entanglement method for preparing the shared quantum states. We discuss how our scheme can be implemented using present-day quantum optics.

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