Steady-state entanglement between hybrid light-matter qubits

¹  Science Department, Technical University of Crete - 73100 Chania, Greece, EU
²  Centre for Quantum Technologies, National University of Singapore - 2 Science Drive 3, 117542 Singapore
³  Department of Physics and Astronomy, University College London - London WC1E 6BT, UK, EU
⁴  Dipartimento di Fisica, Università di Camerino - 62032 Camerino, Italy, EU

Corresponding author: dimitris.angelakis@gmail.com

Received: 12 October 2008
Accepted: 18 December 2008

Abstract

We study the case of two polaritonic qubits localized in two separate cavities coupled by a fiber/additional cavity. We show that classical driving of the intermediate cavity/fiber can lead to the creation of entanglement between the two ends in the steady state. The stationary nature of this entanglement and its survival under dissipation opens possibilities for its production under realistic laboratory conditions. To facilitate the verification of the entanglement in an experiment we also construct the relevant entanglement witness measurable by accessing only a few local variables of each polaritonic qubit.