Physics Colloquium: A scalable source for multi-photon entanglement

Abstract: 

The generation of entanglement between more than two particles is a current challenge in any physical realization. Single photons are one of the most promising realizations of quantum bits (qubits), as they are easily manipulated and preserve their coherence for long times. Quantum information can be stored in many different degrees of freedom of the photons. Only recently, eight photons were entangled in a single state through their polarization degree of freedom. The main difficulties in increasing this number are the elaborated setups required and the low rates of state production. I will present a novel and simple scheme that can in principle generate entanglement between any number of photons from a single setup. Because of some special symmetries of this setup and the fact that it combines photons in different paths and at different times, there are some surprising consequences. Our understanding of non-locality and the measurement of quantum states are challenged.

Seminar Organisers: Dr. Tomer Volansky, Dr. Dovi Poznanski