Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 56: Optomechanics II

Q 56.2: Talk

Thursday, March 3, 2016, 14:45–15:00, f342

Measurement-induced long-distance entanglement of superconducting qubits with optomechanical transducers — •Ondrej Cernotik and Klemens Hammerer — Institute for Theoretical Physics, Institute for Gravitational Physics (Albert Einstein Institute), Leibniz University Hannover, Germany

While superconducting systems provide a promising platform for quantum computing, their networking poses a considerable challenge as they cannot be interfaced directly to light---the natural carrier for transmission of quantum signals through channels at room temperature. Here, we show that remote superconducting qubits can be prepared in entangled states by coupling them to mechanical oscillators whose positions are monitored with optical fields. Continuous homodyne detection of light provides information on the total spin of the two qubits such that entangled qubit states can be post-selected. Entanglement generation is possible without ground state cooling of the mechanical oscillators for systems with an optomechanical cooperativity moderately larger than unity; in addition, our setup tolerates a substantial loss of photons in transmission. The approach is scalable to generation of multipartite entanglement and represents a crucial step towards quantum networks with nodes using superconducting circuits.