1–26 Apr 2019
Nordita, Stockholm
Europe/Stockholm timezone

Generation of multipartite entangled states by an autonomous thermal machine

10 Apr 2019, 10:00
1h
122:026 (Nordita, Stockholm)

122:026

Nordita, Stockholm

Speaker

Jonathan Bohr Brask

Description

Jonatan Bohr Brask

Generation of multipartite entangled states by an autonomous thermal machine

Abstract: Entanglement is a key resource for quantum information processing, and generating and maintaining entanglement is therefore a central challenge. While entanglement is fragile and generally degrades under unavoidable interactions of a system with its environment, it has been realised that dissipation may in some cases aid the generation and stabilisation of entanglement. In particular, heat gradients present in a multipartite system interacting with multiple thermal baths can induce entanglement in a steady state out of thermal equilibrium. Here, we describe a thermal machine capable of generating a large class of highly entangled, multipartite states of qubits, including GHZ-, W-, and cluster states. Entanglement is obtained from the steady state of the machine in a heralded manner. Apart from the heralding step, the machine is fully autonomous, requiring only incoherent couplings to thermal baths and energy-preserving, always-on interactions between parts of the machine. The final heralding step needs only local, projective measurements, which do not by themselves generate any entanglement.

Primary author

Prof. Jonatan Bohr Brask

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