Dissipative preparation of entangled steady states

Seminar

Speaker: Florentin Reiter
When: Nov. 13 2015 10:00
Where: Erwin Schrödinger Saal

Quantum information processing is to a large extent performed using unitary gate operations which are affected by decoherence and dissipation. This imposes limitations on possible quantum information tasks. Engineering dissipation to play an active role in quantum information protocols [1] is therefore considered a promising alternative which bears the potential to overcome problems of unitary quantum information processing. Pionieering experiments in Innsbruck [2] and Copenhagen [3] have demonstrated dissipative preparation of entanglement, using engineered dissipation in connection with either quantum gates [2] or measurements [3]. Engineering dissipation based on continuous, “always-on” couplings, we have developed protocols for the dissipative preparation of steady-state entanglement in several quantum optical and solid-state systems. For cavity QED systems we have shown that our dissipative protocols allow for an improved error scaling as compared to previous methods [4]. Similar dissipative mechanisms can be used to design schemes for the preparation of entangled steady states in trapped ion systems, as has been experimentally demonstrated [5]. In my talk, I will present the theoretical schemes, discuss the experimental results and potential perspectives. If time allows, I will present some recent progress on more general quantum information tasks driven by dissipation, such as scalable generation of many-body GHZ and W states by dissipation [6] and autonomous quantum error correction. [1] B. Kraus, H. P. Büchler, S. Diehl, A. Kantian, A. Micheli, and P. Zoller, Phys. Rev. A 78, 042307 (2008); F. Verstraete, M. M. Wolf, and J. I. Cirac, Nature Phys., 5, 633 (2009). [2] J. T. Barreiro, M. Müller, P. Schindler, D. Nigg, T. Monz, M. Chwalla, M. Hennrich, C. F. Roos, P. Zoller, and R. Blatt, Nature 470, 486 (2011). [3] H. Krauter, C. A. Muschik, K. Jensen, W. Wasilewski, J. M. Petersen, J. I. Cirac, and E. S. Polzik, Phys. Rev. Lett. 107, 080503 (2011). [4] M. J. Kastoryano, F. Reiter, and A. S. Sørensen, Phys. Rev. Lett. 106, 090502 (2011). [5] Y. Lin, J. P. Gaebler, F. Reiter, T. R. Tan, R. Bowler, A. S. Sørensen, D. Leibfried, and D. J. Wineland, Nature 504, 415 (2013). [6] F. Reiter, D. Reeb, and A. S. Sørensen, arxiv:1501.06611 (2015).

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