Large-scale continuous-variable dual-rail cluster entangled state based on spatial mode comb

Optics Express
Junxiang ZhangJ R Gao

Abstract

In recent continuous-variable (CV) multipartite entanglement researches, the number of fully inseparable light modes has been increased dramatically by the introduction of a multiplexing scheme in either the time domain or the frequency domain. In this paper, we propose a scheme that a large-scale (≥ 20) CV dual-rail cluster entangled state is established based on a spatial mode comb in a self-imaging optical parametric oscillator, which is pumped by two spatial Laguerre-Gaussian modes with different polarization and identical frequency. A sufficient condition of full inseparability for a CV dual-rail cluster entangled state is used to evaluate the degree of quantum entanglement. It is shown that entanglement exists over a wide range of analyzing frequency and pump parameter. We have found a new scheme that uses the optical parametric cavity to generate a large-scale entanglement based on optical spatial mode comb. The presented system will be hopefully as a practical entangled source for quantum information.

References

Feb 15, 2001·Physical Review Letters·H J Briegel, R Raussendorf
Oct 8, 2005·Optics Letters·Raphael C Pooser, Olivier Pfister
Jun 13, 2009·Physical Review Letters·M LassenU L Andersen
Jan 1, 1969·Applied Optics·J A Arnaud
Aug 16, 2011·Physical Review Letters·Matthew PysherOlivier Pfister

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