We have proposed a scheme to protect Gaussian states of light from probabilistic erasure, thus achieving the first continuous variables quantum erasure correcting code. We have shown that if one can detect when an erasure occurs, our protocol almost perfectly recover the original states. We have also shown, using postselection, one can relax this assumption and still recover the initial states with high fidelities.
The experimental scheme for correcting coherent states from erasure is shown in the figure. The entangled state is combined with two input states using two beam splitters (BS) and sent through 4 channels which are randomly blocked to simulate erasure noise. Decoding is accomplished by mixing the beams in 3 beam splitters, and finally, conjugate variables of two beams are measured and used to correct the remaining beams.
Optical parametric oscillator used to produce entanglement for the coding.
Publications
Nature photonics (arxiv version)
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