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And now, some physics with Young-Sik Ra from @lkb_lab on “Experiment for generating Non-Gaussian quantum states of multimode light field”
#LTQI
#LTQI
@lkb_lab Young-Sik Ra creates multimode squeezed vacua by pumping an OPO with a multimode pump (a frequency comb with ∼10⁵ modes)
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#LTQI
Young-Sik Ra‘s key operation ins single photon subtraction : â|n⟩=√n|n–1⟩.
The conventional implementation, based on a beamsplitter and ingle photn detection heralding only works for single mode states.
#LTQI
The conventional implementation, based on a beamsplitter and ingle photn detection heralding only works for single mode states.
#LTQI
Young-Sik Ra uses sum frequency generation with a classical pulse gate in a χ⁽²⁾ crystal. The operation is postselected on the detection of an up-converted photon.
The mode is defined by the gate shape. It allows to subtract in any mode superprosition #LTQI
The mode is defined by the gate shape. It allows to subtract in any mode superprosition #LTQI
Young-Sik Ra: It works with mode selectivity 96% and fidelity 94%.
The effect is clearly visible in the statistics of the homodyne detection
#LTQI
The effect is clearly visible in the statistics of the homodyne detection
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Younf-Sik Ra’s paper is
arxiv:1702.02082 arxiv.org/abs/1702.02082,
PRX 7 031012 doi.org/10.1103/PhysRe…
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arxiv:1702.02082 arxiv.org/abs/1702.02082,
PRX 7 031012 doi.org/10.1103/PhysRe…
#LTQI
Young-Sik Ra now uses his freedom to chose modes to subtract photon on entangled states (pairs, but also 4 mode cluster states (line or square)).
For EPR pair, you get state with kurtosis K=2.2 (≥3 fro mistures of Gaussians)
#LTQI
For EPR pair, you get state with kurtosis K=2.2 (≥3 fro mistures of Gaussians)
#LTQI
Young-Sik Ra also plays with two 4 mode cluster states. Subtracting a photon always decreases the kurtosis in another mode.
#LTQI
#LTQI
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