HQOC/ITAMP Joint Quantum Sciences Seminar
Wednesday, September 21, 2016
4:00 PM, Jefferson 250
Prof. Jelena Vuckovic, Stanford
"Quantum nanophotonics"
Nanophotonic structures that localize photons in sub-wavelength volumes are possible today
thanks to modern nanofabrication and optical design techniques. Such structures enable
studies of new regimes of light-matter interaction, quantum and nonlinear optics, and new
applications in computing, communications, and sensing. I will review our recent work on
the traditional quantum nanophotonics platform based on InAs quantum dots inside GaAs
photonic crystal cavities [1-3], as well as our progress on alternative material systems
diamond and silicon carbide [4], which could potentially bring the described experiments
to room temperature and facilitate scaling to large networks of resonators and emitters.
Finally, the use of inverse design nanophotonic methods [5], that can efficiently perform
physics-guided search through the full parameter space, leads optical devices with
properties superior to state of the art, including smaller footprints, better field
localization, and novel functionalities.
[1] Optica, vol. 3, 931-936 (2016)
[2] Nature Photonics,vol. 10, pp. 163-166 (2016)
[3] Physical Review Letters, vol. 114, 233601 (2015)
[4] Nano Letters, vol. 16 (1), pp. 212-217 (2016)
[5] Nature Photonics 9, 374-377 (2015)
Srujan Meesala, Loncar Group
"Strain engineering of silicon vacancy centers in diamond MEMS cantilevers"
The silicon vacancy (SiV) center in diamond has recently attracted attention as a solid
state quantum emitter due to its attractive optical properties. We fabricate diamond MEMS
cantilevers, and use electrostatic actuation to apply controlled strain fields to single
SiV centers implanted in these devices. The strain response of the SiV electronic levels
is measured - we demonstrate over 100 GHz tuning for the mean optical transition
frequency, and over 400 GHz tuning for the orbital splitting within the ground state. The
interaction Hamiltonian for strain fields is inferred, and large strain susceptibilities
of the order 1 PHz/strain are measured. We discuss prospects to utilize our device to
reduce phonon-induced decoherence in SiV spin qubits, and to exploit the large strain
susceptibility for hybrid quantum systems based on nanomechanical resonators.
Student Presentation from 4:00-4:10 PM
Refreshments Served from 4:10-4:30 PM
Guest Presentation from 4:30-6:00 PM
--
Clare Ploucha
Faculty Assistant to Professors Lukin & Greiner and their labs
Department of Physics
17 Oxford St., Lyman 324A
Cambridge, MA 02138
P. (617) 496-2544
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