Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 3: Quantum Dynamics, Decoherence and Quantum Information II
DY 3.4: Vortrag
Montag, 11. März 2013, 15:45–16:00, H39
Genuine three-qubit entanglement from coupling to a heat bath — •Christopher Eltschka1, Daniel Braun2,3, and Jens Siewert4,5 — 1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany — 2Université de Toulouse, Laboratoire de Physique Théorique (IRSAMC), F-31062 Toulouse, France — 3CNRS, LPT (IRSAMC), F-31062 Toulouse, France — 4Departamento de Química Física, Universidad del País Vasco UPV/EHU, 48080 Bilbao, Spain — 5Ikerbasque, Basque Foundation for Science, 48011 Bilbao, Spain
Initially unentangled qubits which do not interact which each other can become entangled by interacting with a common heat bath [1]. But with more than two qubits, there exist several inequivalent types of entanglement [2]. Therefore it is an important question which types of entanglement can be generated. While exactly determining and quantifying the entanglement for mixed states of more than two qubits is an unsolved problem, recent advancements [3] based on the Greenberger-Horne-Zeilinger symmetry [4] allow to determine a good lower bound for the entanglement. By using those methods we show that for three qubits coupled to the same heat bath indeed all types of entanglement can be generated for almost all separable initial states.
[1] D. Braun, Phys. Rev. Lett. 89, 277901 (2002).
[2] W. Dür, G. Vidal, and J.I. Cirac, Phys. Rev. A 62, 062314 (2000).
[3] C. Eltschka and J. Siewert, to be published in Scientific Reports.
[4] C. Eltschka and J. Siewert, Phys. Rev. Lett. 108, 020502 (2012).