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QES Seminar, 4/19/10: Quantum dots in photonic crystals: from quantum information processing to single photon nonlinear optics

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Andrei Faraon
E.L. Ginzton Laboratory, Stanford University, Stanford, CA, 94305
Present affiliation: Hewlett-Packard Laboratories, 1501 Page Mill Rd., Palo Alto, CA, 94304

Quantum dots and photonic crystals can be integrated into a highly versatile platform for future micro and nano-scale optical networks for classical and quantum information processing. However, for these networks to operate, all the photonic components and the quantum dots need to be precisely controlled on an individual basis. To this end, we have developed local control techniques for temperature, index of refraction, and electric field. These techniques have been applied to photonic crystal cavities with strongly coupled quantum dots, thus enabling several experiments that rely on the physics of light-matter interaction at the most fundamental quantum level. First, we demonstrated that a single quantum dot can be effectively used to change the transmission function of the cavity, both when the cavity is isolated or coupled to optical waveguides. The same system was then used to show how light flow through the resonator is governed by optical nonlinearities at the single photon level, namely photon blockade and photon induced tunneling. More recently, with the development of on-chip electrical control, we implemented an electro-optic switch based on the cavity quantum electrodynamics and the quantum confined Stark effect in a strongly coupled cavity-quantum dot system. The switch is predicted to operate at speeds up to 10GHz and energies as low as 0.5fJ/bit, two orders of magnitude lower than current state of the art electro-optic switches. All these experiments point towards the development of a new class of optoelectronic devices where light is controlled at the level of single quanta via strong coupling to single emitters. With enough control capabilities, it may not be long until we see these devices in ultra-low power optical interconnects, all optical logic devices, quantum repeaters, and ultimately quantum computers.
1. Faraon et al, Fast Electrical Control of a Quantum Dot Strongly Coupled to a Photonic Crystal Cavity, Physical Review Letters, Vol. 104, 047402 (2010)
2. Faraon et al, Coherent generation of nonclassical light on a chip via photon-induced tunneling and blockade,  Nature Physics, 4, 859 - 863 (2008)
3. Englund et al,  Controlling Cavity Reflectivity With a Single Quantum Dot , Nature, vol. 450, number 7171, pp. 857-861 (2007).
Andrei Faraon received his PhD (2009) in Applied Physics from Stanford University, where he worked in the group of Prof. Jelena Vuckovic. His PhD work was focused on developing integrated photonic crystal

Location: Bowen Hall Atrium

Date/Time: 04/19/10 at 12:30 pm - 04/19/10 at 1:30 pm

Category: PRISM/MITRE (QES) Seminar Series

Department: PRISM