2015 BFY II Abstract Detail Page

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Abstract Title: Witnessing Entanglement
Abstract: An entangled state of a two-particle system is a quantum state that cannot be separated--it cannot be written as the product of states of the individual particles. One way to tell if a system is entangled is to use it to violate a Bell inequality (such as the Clauser-Horne-Shimony-Holt, CHSH, inequality), because entanglement is necessary to violate these inequalities. However, there are other, easier to perform measurements that determine whether or not a system is entangled; an operator that corresponds to such a measurement is referred to as an entanglement witness. We present the theory of witness operators, and an undergraduate experiment that measures an entanglement witness for the joint polarization state of two photons. We are able to produce states for which the expectation value of the witness operator is entangled by more than 200 standard deviations.
Abstract Type: Poster

Author/Organizer Information

Primary Contact: Mark Beck
Whitman College
Department of Physics
345 Boyer Ave
Walla Walla, WA, WA 99362
Phone: 509-527-5260
and Co-Presenter(s)
Marisol N. Beck, Harvey Mudd College

Presentation Documents

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