Enhanced cooling for stronger qubit-phonon couplings

Here we present details on how the cooling effects of an opto-mechanical system are affected beyond the secular approximation. To this end, a laser driven two-level quantum dot (QD) embed- ded in a phononic nano-cavity is investigated for moderately strong QD-phonon couplings regimes. For these regi...

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Bibliographic Details
Published in:arXiv.org 2018-03
Main Authors: Ceban, Victor, Macovei, Mihai A
Format: Article
Language:English
Subjects:
Approximation
Cooling
Cooling effects
Couplings
Mathematical analysis
Mechanical systems
Phonons
Quantum dots
Qubits (quantum computing)
System dynamics
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Summary:Here we present details on how the cooling effects of an opto-mechanical system are affected beyond the secular approximation. To this end, a laser driven two-level quantum dot (QD) embed- ded in a phononic nano-cavity is investigated for moderately strong QD-phonon couplings regimes. For these regimes, the use of a secular approximation within the QD-phonon interaction terms is no longer justified as the rapidly oscillating terms cannot be neglected from the system dynamics. Therefore, one shows that although being small, their contribution plays an important role when quantum cooling is achieved. The main contribution of the fast oscillating terms is analytically estimated and one compares how the quantum cooling dynamics change within or beyond the sec- ular approximation. The behavior of the quantum cooling effect is investigated in the steady-state regime via the phonon field statistics.
ISSN:2331-8422