Decoherence as attenuation of mesoscopic echoes in a spin-chain channel | Phys. Rev. A 82, 012310 (2010)

Posted on Updated on

Decoherence as attenuation of mesoscopic echoes in a spin-chain channel

Gonzalo A. Álvarez1,*, Ernesto P. Danieli2,†, Patricia R. Levstein3, and Horacio M. Pastawski3,‡

1Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany

2ITMC, RWTH Aachen University, D-52074 Aachen, Germany

3Facultad de Matemática, Astronomía y Física and Instituto de Física Enrique Gaviola, Universidad Nacional de Córdoba, 5000 Córdoba, Argentina

Received 12 May 2010; published 13 July 2010

An initial local excitation in a confined quantum system evolves, exploring the whole system and returning to the initial position as a mesoscopic echo at the Heisenberg time. We consider two weakly coupled spin chains, a spin ladder, where one is a quantum channel while the other represents an environment. We quantify decoherence in the quantum channel through the attenuation of the mesoscopic echoes. We evaluate decoherence rates for different ratios between sources of amplitude fluctuation and dephasing in the interchain interaction Hamiltonian. The many-body dynamics is seen as a one-body evolution with a decoherence rate given by the Fermi golden rule.

© 2010 The American Physical Society

via Phys. Rev. A 82, 012310 (2010): Decoherence as attenuation of mesoscopic echoes in a spin-chain channel.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s