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Detection of Qubit-Oscillator Entanglement in Nanoelectromechanical Systems

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Schmidt TL, Borkje K, Bruder C, Trauzettel B,
Project Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems
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Original article (peer-reviewed)

Volume (Issue) 104(17)
Page(s) 177205 - 177205
Title of proceedings PHYSICAL REVIEW LETTERS


Experiments over the past years have demonstrated that it is possible to bring nanomechanical resonators and superconducting qubits close to the quantum regime and to measure their properties with an accuracy close to the Heisenberg uncertainty limit. Therefore, it is just a question of time before we will routinely see true quantum effects in nanomechanical systems. One of the hallmarks of quantum mechanics is the existence of entangled states. We propose a realistic scenario making it possible to detect entanglement of a mechanical resonator and a qubit in a nanoelectromechanical setup. The detection scheme involves only standard current and noise measurements of an atomic point contact coupled to an oscillator and a qubit. This setup could allow for the first observation of entanglement between a continuous and a discrete quantum system in the solid state.