Bulletin of the American Physical Society
41st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 55, Number 5
Tuesday–Saturday, May 25–29, 2010; Houston, Texas
Session S1: Controlling Dissipation in Quantum Systems |
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Chair: Jake Taylor, National Institute of Standards and Technology Room: Imperial East |
Friday, May 28, 2010 2:00PM - 2:30PM |
S1.00001: Dissipation and Coherence; an example in Cavity QED Invited Speaker: Dissipation destroys coherence in many quantum systems, but under particular circumstances, it can create and probe it. Our experiment in optical cavity QED where the rates of spontaneous emission and the escape of the light from the cavity are similar to the coherent coupling between the atom and the cavity mode shows how the detection of spontaneous emission with a particular polarization creates coherent superpositions of ground states. These superpositions are robust and through conditional measurements of the spontaneous emission show their evolution. We show experimental and theoretical studies of the system that works with a slow beam of cold $^{85}$Rb atoms. We identify different contributions to the signal and show ways to control it and perform quantum feedback. Work done in collaboration with David G. Norris, Andres Cimmarusti, Howard J. Carmichael, and Pablo Barberis [Preview Abstract] |
Friday, May 28, 2010 2:30PM - 3:00PM |
S1.00002: Dissipative processes for quantum simulation and computation Invited Speaker: Dissipative processes and decoherence have traditionally been seen as the main obstacles to build a scalable quantum computer. However, if the dissipation can be engineered to include many-body processes, it can be turned into a resource allowing for robust quantum computation and quantum simulation: the result of the quantum computation or simulation arises as the steady-state of a many-body master equation. As a novel application of those ideas, we will also discuss the quantum Metropolis algorithm, which is the first quantum algorithm that allows to simulate static properties of quantum many-body systems. [Preview Abstract] |
Friday, May 28, 2010 3:00PM - 3:30PM |
S1.00003: Strong dissipation inhibits losses and induces correlations in cold molecular gases Invited Speaker: Atomic quantum gases in the strong-correlation regime offer unique possibilities to explore a variety of many-body quantum phenomena. Reaching this regime has usually required both strong elastic and weak inelastic interactions, as the latter produce losses. We show that strong inelastic collisions can actually inhibit particle losses and drive a system into a strongly-correlated regime. Studying the dynamics of ultracold molecules in an optical lattice confined to one dimension, we show that the particle loss rate is reduced by a factor of 10. Adding a lattice along the one dimension increases the reduction to a factor of 2000. Our results open up the possibility to observe exotic quantum many-body phenomena with systems that suffer from strong inelastic collisions [1-3]. \\[4pt] [1] N. Syassen et al., Science 320, 1329 (2008).\\[0pt] [2] J. J. Garcia-Ripoll et al., New J. Phys. 11, 013053 (2009).\\[0pt] [3] S. D\"urr et al., Phys. Rev. A 79, 023614 (2009). [Preview Abstract] |
Friday, May 28, 2010 3:30PM - 4:00PM |
S1.00004: A Rydberg Quantum Simulator for Dissipative Dynamics Invited Speaker: Following Feynman and as elaborated on by Lloyd, a universal quantum simulator is a controlled quantum device which reproduces the dynamics of any other many particle quantum system with short range interactions. This dynamics can refer to both coherent Hamiltonian and dissipative open system evolution. Here we show that laser excited Rydberg atoms in large spacing optical or magnetic lattices provide an efficient implementation of a universal QS for spin models involving (high order) n-body interactions. This includes the simulation of Hamiltonians of exotic spin models involving n-particle constraints such as the Kitaev toric code, color code, and lattice gauge theories with spin liquid phases. In addition, it provides the ingredients for dissipative preparation of entangled states based on engineering n-particle reservoir couplings. The key basic building blocks of our architecture are efficient and high-fidelity n-qubit entangling gates via auxiliary Rydberg atoms, including a possible dissipative time step via optical pumping. This allows to mimic the time evolution of the system by a sequence of fast, parallel and high-fidelity n-particle coherent and dissipative Rydberg gates. [Preview Abstract] |
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