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The optimal phase estimation based on output photon number statistics of two-path interferometers is discussed. It is shown that for many pure states, conventional photon detection is sufficient to achieve the uncertainty limit.
Using the photons produced by parametric down-conversion, we report an experimental observation of a violation of the Bell inequality for energy and time based purely on the geometric phases of the downconverted photons.
We present the joint photon-number statistics of a locally photon-subtracted two-mode vacuum squeezed state of light. Comparison to the unsubtracted statistics shows a successful photon subtraction and the expected shift by one photon number.
This paper proposes a three-party quantum secret sharing scheme based on entanglement without local unitary operations. The message sender prepares the entangled states and sends them to the agents, who can obtain the secret message by only performing measurement on their photons if all of the agents collaborate. In contrast to the use of local unitary operations in most of other schemes, our scheme...
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