Bulletin of the American Physical Society
39th Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics
Volume 53, Number 7
Tuesday–Saturday, May 27–31, 2008; State College, Pennsylvania
Session O1: Quantum Control of Polar Molecules |
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Chair: Paul Lett, National Institute of Standards and Technology Room: Nittany Lion Inn Ballroom CDE |
Friday, May 30, 2008 8:00AM - 8:36AM |
O1.00001: Toward Quantum Computing with Polar Molecules Invited Speaker: The unique properties of polar molecules make them potentially very attractive for quantum information processing. The rotational degree of freedom gives such molecules large polarizability at DC and microwave frequencies, enabling strong couplings between distant molecules; at the same time, rotationally excited states have very long intrinsic lifetimes, enabling storage of information. In this talk I will discuss evolving ideas for possible architectures to take advantage of these properties. In all cases, the ability to cool and trap polar molecules at high phase space density is a necessary step. I will also discuss our experimental progress towards this goal. [Preview Abstract] |
Friday, May 30, 2008 8:36AM - 9:12AM |
O1.00002: Optimal Control Theory and Quantum Information Systems Invited Speaker: Building a working quantum information processing system requires extremely precise control over the strongly coupled dynamics of suitable quantum systems. Ultracold molecular interactions represent a promising candidate for scalable quantum information processing in the AMO field. Quantum optimal control theory, developed in the context of laser-assisted molecular reactions, has already been shown to yield improvements for quantum devices that can take performance beyond the otherwise unattainable fault-tolerance threshold. The talk will introduce various schemes to attain this, and discuss several open questions concerning the robustness of the approach in the presence of noise, dissipation, imprecise control and other imperfections. [Preview Abstract] |
Friday, May 30, 2008 9:12AM - 9:48AM |
O1.00003: Quantum information processing and non-linear optics using polar molecules Invited Speaker: How can one use the hierarchy of levels of polar molecules in conjunction with their permanent dipole moments to create and manipulate nonlinear interactions? One way is by changing the dipole moments - and therefore the dipole-dipole interaction strength - by simply coupling different molecular states using light. Those states, e.g., different electronic states or single and superposition rotational states, can have vastly different dipole moments. Dipole-dipole mediated phase-gates of single-molecule qubits are thus straightforward to construct. Another way is to use the same dipole-dipole nonlinearities to create effective nonlinear coupling between photons. Those photons propagate through the non-linear medium as so-called ``slow-light polaritons'' and thus allow to create the basis for deterministic optical quantum information processing. The particular challenges and promises of these techniques will be discussed in conjunction with the main decoherence mechanisms and possible ways to mitigate them. [Preview Abstract] |
Friday, May 30, 2008 9:48AM - 10:24AM |
O1.00004: Cold Polar Molecules and Applications Invited Speaker: Cold polar molecules lead us to new territories such as engineered quantum simulation, quantum computation, quantum condensed systems, quantum collision dynamics and to searches for physics beyond the Standard Model. The electric dipole moment that polar molecules carry is the key. Applied laboratory electric fields can effectively mix opposite parity rotational states, inducing dipoles with the strength of a full atomic unit. These dipoles interact strongly with external fields and with each other at long range -- features that can be used to produce new many-body effects and control internal and external molecular degrees of freedom. New explorations and applications are envisioned for polar molecules. For example, placed on an optical lattice, molecules may provide a ``toolbox'' for creating spin-lattice Hamiltonians. Similarly, electric dipoles could be used as a quantum bits. For these and other reasons, considerable effort is focussed on making high density samples of trapped polar molecules. There are several approaches being taken to produce such high phase-space density samples of ground-state polar molecules with approximately 40 groups engaged in, or launching, an effort. Our approach to cold polar molecules starts with buffer-gas cooling. Cold helium gas is used to cool molecules from their initial production temperature (usually $\approx$100-1000 K) to around 1 K. Once cold, molecules can be loaded into traps or extracted in the form of a beam. Recent work in our group has led to results on spin relaxation in $\Sigma$ state diatomic molecules, trapping of new species, demonstration of a novel high flux cold molecular beam technique and a proposal for an improved search for the electron electric dipole moment. Along with these results, a short introduction to the other methods of cold molecule production will be given. [Preview Abstract] |
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