內容：

Abstract: There are high fluctuations of the phase in the M-Z interference we did in the  SPDC system, which is a big problem. I would like to discuss on how to build up an

active phase stabilization system and see the details at the paper Opt. Express, 19, 22723-22730 (2011). Then I will talk about quantum entanglement, which is very important for

quantum information processing. One interesting thing is about “quantum steering into the past” which will be published in Nature Physics (arxiv:1203.4834(2012)); and another is

about blind cluster states which is used for preserving the privacy of a computation and published on Science 335, 303 (2012).

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