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Abstracts of papers - American Chemical Society

Quantum interference experiments with organic molecules: Information about internal states of spatially quantum delocalized molecules

Markus Arndt, Stefan Gerlich, Sandra Eibenberger, Stefan Nimmrichter, Klaus Hornberger, Jens Tüxen, Marcel Mayor

Published Mar 27, 2011• 0 citations
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Abstract

Author: Arndt, M. et al.; Genre: Journal Article; Issued: 2011-03-27; Title: Quantum interference experiments with organic molecules: Information about internal states of spatially quantum delocalized molecules

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Recent experiments have shown that fullerene and fluorofullerene molecules can produce interference patterns. These molecules have both rotational and vibrational degrees of freedom. This leads one to ask whether these internal motions can play a role in degrading the interference pattern. We study this by means of a simple model. Our molecule consists of two masses a fixed distance apart. It scatters from a potential with two or several peaks, thereby mimicking two or several slit interference. We find that in some parameter regimes the entanglement between the internal states and the translational degrees of freedom produced by the potential can decrease the visibility of the interference pattern. In particular, different internal states correspond to different outgoing wave vectors, so that if several internal states are excited, the total interference pattern will be the sum of a number of patterns, each with a different periodicity. The overall pattern is consequently smeared out. In the case of two different peaks, the scattering from the different peaks will excite different internal states so that the path the molecule takes becomes entangled with its internal state. This will also lead to degradation of the interference pattern. How these mechanisms might lead to the emergence of classical behavior is discussed.
Author: Wei, Qi et al.; Genre: Journal Article; Issued: 2011-10-17; Open Access; Keywords: Proposals for quantum computing using rotational states of polar molecules as qubits have previously considered only diatomic molecules. For these the Stark effect is second-order, so a sizable external electric field is required to produce the requisite dipole moments in the laboratory frame. Here we consider use of polar symmetric top molecules. These offer advantages resulting from a first-order Stark effect, which renders the effective dipole moments nearly independent of the field strength. That permits use ofmuch lower external field strengths for addressing sites. Moreover, for a particular choice of qubits, the electric dipole interactions become isomorphous with NMR systems for which many techniques enhancing logic gate operations have been developed. Also inviting is the wider chemical scope, since many symmetric top organic molecules provide options for auxiliary storage qubits in spin and hyperfine structure or in internal rotation states.; Title: Entanglement of polar symmetric top molecules as candidate qubits