Events Calendar
Resolved Sideband Emission of Quantum Dots Strained by Surface Acoustic Waves
Thursday May 10, 2012
| 3:30 pm
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Presenter: | Stephen M. Carr, Sandia National Laboratory, Albuquerque, NM |
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| Series: | CQuIC Seminars | |
| Abstract: | Remarkable and relentless progress has recently been realized in the pursuit of the cooling of mesoscopic mechanical systems toward the quantum ground state. For certain optomechanical and electromechanical cooling schemes, a key technical requirement is the attainment of the resolved sideband regime, where the mesoscopic mechanical mode frequency exceeds the linewidth of the central resonance. A particularly intriguing theoretical proposal [1] is based on resonant laser excitation of a phonon sideband of a quantum dot embedded in a mesoscopic mechanical resonator. In this seminar I will describe my previous experimental work, performed at the National Institute of Standards and Technology (NIST), on self-assembled quantum dots strained by surface acoustic waves, which was motivated in part by the aforementioned theoretical proposal [1]. A cryogenic experimental apparatus was designed, constructed, and implemented to enable precision optical measurements and radio-frequency electrical transmission to a semiconductor chip at low temperature. Surface acoustic waves in the GHz range were generated on-chip using nanofabricated interdigital transducers, resulting in the controlled inducement of phonon sidebands in the quantum dot emission spectrum. The resolved sideband regime and optical frequency conversion were experimentally demonstrated [2] using resonant spectroscopy. Finally, I will briefly describe my current work at Sandia National Laboratory on the experimental investigation of adiabatic and non-adiabatic qubit evolution and encoding using semiconductor devices, including electrostatically-defined quantum dots. [1] Physical Review Letters 92, 075507 (2004). [2] Physical Review Letters 105, 037401 (2010). | |
| Location: | PAIS-2540, PAIS | |
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