Preparation and measurement of strongly interacting states of photons

Mohammad F. Maghrebi, Ofer Firstenberg, Alexey Vyacheslavovich Gorshkov

R. O. Umucalılar, Michiel Wouters, Iacopo Carusotto

We propose methods to create and observe Laughlin-like states of photons in a strongly nonlinear optical cavity. Such states of strongly interacting photons can be prepared by pumping the cavity with a Laguerre-Gauss beam, which has a well-defined orbital angular momentum per photon. The Laughlin-like states appear as sharp resonances in the particle-number-resolved transmission spectrum. Power spectrum and second-order correlation function measurements yield unambiguous signatures of these few-particle strongly correlated states.

Aephraim M. Steinberg

Recent advances make it possible to entangle multiple photons, despite the absence of strong photon-photon interactions. We present experiments generating “noon” states applicable to quantum interferometry, and complete quantum tomography of such states.

Thad G Walker

Şebnem Güneş Söyler, Thomas Pohl

Ming Yuan Gao, Wenhua Hu, Cheng-Zu Li

We present a scheme for preparing three-photon polarization-entangled W states. The signal photons and a strong probe field interact via weak cross-Kerr nonlinearity that conditionally causes a phase shift on the probe coherent state. A W state is then prepared with a high success probability by the homodyne measurement and postselection. The generating method is simple and efficient.