Demonstrations of EPR steerable polarization-entangled photon states

Presenting Author: Evan Atchison, Harvey Mudd College
Contributing Author(s): Chen Jie Xin, Colter Downing, Theresa W. Lynn

EPR steering is a signature of a class of two-qubit states for which an untrusted party, Alice, possessing one of the qubits can prove to an observer, Bob, who possesses the other qubit, that their qubits are entangled. This class of states is a strict superset of Bell nonlocal states, and thus includes states with too little entanglement to be Bell nonlocal. Surprisingly, given the mutual nature of bipartite entanglement, certain two-qubit states are actually one-way steerable, with Alice being able to prove entanglement to Bob, but not vice versa. EPR steering, both mutual and one-way, could be useful as a signature of partial entanglement in a variety of quantum communication or distributed quantum computing schemes. One-way steering has the potential for further application in communication protocols where the level of trust is asymmetric between the parties. We study EPR-steerable states of photon pairs entangled in polarization, produced via spontaneous parametric down-conversion. By adjusting the entanglement purity via the introduction of randomly polarized photons into an otherwise maximally-entangled state, we successfully map out ranges of entangled states that are Bell nonlocal and steerable, Bell local but steerable, or Bell local and not steerable. Our current efforts focus on using the same experimental platform to explore the counterintuitive case of one-way steerable entangled states.

(Session 5 : Thursday from 5:00pm - 7:00 pm)


SQuInT Chief Organizer
Akimasa Miyake, Assistant Professor

SQuInT Co-Organizer
Mark M. Wilde, Assistant Professor LSU

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SQuInT Founder
Ivan Deutsch, Regents' Professor

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