Entanglement generation by Fock-state filtration |
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| Authors: | Resch K J O'Brien J L Weinhold T J Sanaka K Lanyon B P Langford N K White A G |
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| Institution: | Department of Physics & Centre for Quantum Computer Technology, University of Queensland, Brisbane, QLD 4072, Australia. |
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| Abstract: | We demonstrate a Fock-state filter which is capable of preferentially blocking single photons over photon pairs. The large conditional nonlinearities are based on higher-order quantum interference, using linear optics, an ancilla photon, and measurement. We demonstrate that the filter acts coherently by using it to convert unentangled photon pairs to a path-entangled state. We quantify the degree of entanglement by transforming the path information to polarization information; applying quantum state tomography we measure a tangle of T=(20+/-9)%. |
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