Universal entangler with photon pairs in arbitrary states

Abstract

We propose a setup that transforms a photon pair in arbitrary rank-four mixed state, which could also be unknown, to a Bell state. The setup involves two linear optical circuits processing the individual photons and a parity gate working with weak cross-Kerr nonlinearity. By the photon number resolving detection on one of the output quantum bus or communication beams, the setup will realize a near deterministic transformation to a Bell state for every entangling attempt. With the simple threshold detectors, on the other hand, the system can still reach a considerable success probability of 0.5 per try. The decoherence effect caused by photon absorption losses in the operation is also discussed.

7 pages, 4 figures

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• Efficient two-step entanglement concentration for arbitrary W states
• Cross-Kerr nonlinearity between continuous-mode coherent states and single photons
• Weaving independently generated photons into an arbitrary graph state
• Efficient hybrid entanglement concentration for quantum communications
• Addendum to "Single photon logic gates using minimum resources"
• Efficient and flexible generation of entangled qudits with cross phase modulation
• Efficient entanglement concentration for arbitrary less-entangled NOON state assisted with single photon