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We experimentally demonstrate a conversion of a single-photon state into a superposition of two weak coherent states and its inverse, via squeezing operation based on offline-prepared squeezed states, measurement and feedforward.
Toward the implementation of universal quantum computing in the optical frequency comb, we recently demonstrated the entanglement of 60 cavity modes of a single optical parametric oscillator into 15 independent quadripartite ring cluster states.
We report the simultaneous experimental generation of multiple quadripartite continuous-variable cluster states in the optical frequency comb of a single optical parametric oscillator operating below threshold.
We demonstrate “undoing” quantum non-demolition gates by quantum erasing. In one-way quantum computation, these operations remove unwanted nodes from cluster states. Experimentally one mode was removed from two-mode and four-mode cluster state, respectively.
We experimentally demonstrate a quantum nondemolition (QND) interaction, based upon offline-prepared, squeezed ancilla states and homodyne measurements with feedforward. The resulting QND gate is verified via the criteria for QND measurements of each conjugate quadrature.
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