Volume 95, Number 4, August 2011
|Number of page(s)||6|
|Published online||03 August 2011|
Cooling a nanomechanical resonator by a triple quantum dot
Department of Physics and State Key Laboratory of Surface Physics, Fudan University - Shanghai 200433, China
2 Department of Applied Physics, Hong Kong Polytechnic University - Hung Hom, Hong Kong, China
Accepted: 7 July 2011
We propose an approach for achieving ground-state cooling of a nanomechanical resonator (NAMR) capacitively coupled to a triple quantum dot (TQD). This TQD is an electronic analog of a three-level atom in Λ configuration which allows an electron to enter it via lower-energy states and to exit only from a higher-energy state. By tuning the degeneracy of the two lower-energy states in the TQD, an electron can be trapped in a dark state caused by destructive quantum interference between the two tunneling pathways to the higher-energy state. Therefore, ground-state cooling of an NAMR can be achieved when electrons absorb readily and repeatedly energy quanta from the NAMR for excitations.
PACS: 03.65.Ta – Foundations of quantum mechanics; measurement theory / 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 73.21.La – Quantum dots
© EPLA, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.