2015/12/31 by Ondřej Černotík, Klemens Hammerer · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Cluster state #Electrical engineering #Engineering #Mechanical and Optical Resonators #Multipartite #Multipartite entanglement #Physics #Quantum #Quantum Information and Cryptography #Quantum computer #Quantum entanglement #Quantum information #Quantum mechanics #Quantum network #Quantum teleportation #Qubit #Squashed entanglement #Superconducting quantum computing #Topology (electrical circuits) #W state #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physreva.94.012340
published as Phys. Rev. A 94, 012340 (2016) · Updated figures, close to published version
openalex publication_date 2016/07/25 · arxiv created 2016/07/29 · arxiv updated 2016/08/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Although superconducting systems provide a promising platform for quantum computing, their networking poses a challenge because they cannot be interfaced to light, the medium used to send quantum signals through channels at room temperature. We show that mechanical oscillators can mediate such coupling and light can be used to measure the joint state of two distant qubits. The measurement provides information on the total spin of the two qubits such that entangled qubit states can be postselected. Entanglement generation is possible without ground-state cooling of the mechanical oscillators for systems with optomechanical cooperativity moderately larger than unity; in addition, our setup tolerates a substantial transmission loss. The approach is scalable to the generation of multipartite entanglement and represents a crucial step towards quantum networks with superconducting circuits.