Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Poster: Quantum Optics and Photonics III

Q 53.48: Poster

Thursday, March 9, 2017, 17:00–19:00, P OG2

Continuous-variable quantum teleportation can enhance probabilistic discrete-variable quantum gates — •Fabian Ewert and Peter van Loock — Johannes Gutenberg-Universität Mainz

We propose a linear optical generalization of the probabilistic nonlinear sign-shift gate, presented by KLM [Nature 409, 46-52 (2001)] that approximates a strong self-kerr interaction up to the d-photon Fock state. Applying this highly probabilistic gate to the resource state of a continuous-variable quantum teleportation and replacing the standard correcting operation, i.e. a displacement, by a nonlinear displacement yields a nonlinear sign-shift gate on the input mode of the teleportation setup. By choosing d large enough and conditioning the teleportation accordingly, the success probability of this gate can be pushed above the 25% limit of the KLM gate while maintaining a near-unit fidelity. This can also be used to implement a controlled-SIGN gate with a probability higher than the current linear-optics maximum of 2/27.