Continuous variable quantum information protocols with squeezed light

Akira Furusawa, Alexander I. Lvovsky

Akira Furasawa

Kuanshou Zhang

The preparation of Continuous Variable(CV) squeezed light plays a key role in quantum optics and quantum information.Particularly,multimode squeezed light in CV have great potential application in quantum communication,quantum commutation and high precision measurement.In the review,we describe the research progress in this area,with focus on CV multimode squeezed state.

Christian Peuntinger, Bettina Heim, Christian R. Müller +3 more

Continuous variable quantum states of light are used in quantum information protocols and quantum metrology and known to degrade with loss and added noise. We were able to show the distribution of bright polarization squeezed quantum states of light through an urban free-space channel of 1.6 km length. To measure the squeezed states in this extreme environment, we utilize polarization encoding and a postselection protocol that is taking into account classical side information stemming from the distribution of transmission values. The successful distribution of continuous variable squeezed states is accentuated by a quantum state tomography, allowing for determining the purity of the state.

Takao Aoki

Nonlocal correlation of an entangled state enables one to perform quantum communication. Continuous variable bipartite entangled state, or Einstein-Podolsky-Rosen state, has been employed to demonstrate bipartite quantum protocols. By generating multipartite entanglement, it is also possible to perform multipartite quantum protocols. In this paper, we review the generation and verification of continuous variable multipartite entanglement.

Warwick P. Bowen