Quantum information with quantum dots
Quantum dots are artificial atoms embedded in a semiconductor material. We study methods to strongly interact quantum dots with light by placing them in photonic crystal cavities that generate strong light-matter interactions. These devices confine both atomic quantum memory and photons on a semiconductor chip for compact quantum devices. We have developed new methods to store and manipulate quantum information and tailor light-matter interactions for applications in quantum networking and distributed quantum computation.
"Deterministic generation of entanglement between a quantum-dot spin and a photon," Shuo Sun and Edo Waks, Physical Review A 90, 042322 (2014)
"A quantum logic gate between a solid-state quantum bit and a photon," Hyochul Kim, Ranojoy Bose, Thomas C. Shen, Glenn S. Solomon, and Edo Waks, Nature Photonics 7, 373-377 (2013)
"Protocol for hybrid entanglement between a trapped atom and a quantum dot," Edo Waks and C. Monroe, Physical Review A 80, 062330 (2009)
Ultra-low energy nonlinear optics
Optical nonlinearity is an essential resource for a broad range of applications in communication and opto-electronics. Nonlinear optical effects typically require large energies and induce significant power dissipation that limits their use. We are studying methods to exploit strong interactions between optical emitters and cavities to achieve highly energy efficient nonlinear optical devices that operate at energies of a few photons. Such attojoule level nonlinearities could potentially enable opto-electronic devices that are both extremely fast and energy efficient.
"Resonant Interactions between a Mollow Triplet Sideband and a Strongly Coupled Cavity," Hyochul Kim, Thomas C. Shen, Kaushik Roy-Choudhury, Glenn S. Solomon, and Edo Waks, Physical Review Letters 113, 027403 (2014)
Low-Photon-Number Optical Switching with a Single Quantum Dot Coupled to a Photonic Crystal Cavity," Ranojoy Bose, Deepak Sridharan, Hyochul Kim, Glenn S. Solomon, and Edo Waks, Physical Review Letters 108, 227402 (2012)
Nanoscale quantum emitters are ideal probes for sensing optical, magnetic, and thermal properties of target objects with nanometer resolution. We combine electro-osmotic flow control with fluorescence tracking to deliver these probes to target locations with nanocale precision, and map out local electromagnetic properties. These techniques have a broad range of applications in super-resolution imaging, biological and chemical detection, and nanophotonics.
"Nanoscale imaging and spontaneous emission control with a single nano-positioned quantum dot," Chad Ropp, Zachary Cummins, Sanghee Nah, John T. Fourkas, Benjamin Shapiro, and Edo Waks, Nature Communications 4, 1447 (2013)
"Manipulating Quantum Dots to Nanometer Precision by Control of Flow," Chad Ropp, Roland Probst, Zachary Cummins, Rakesh Kumar, Andrew J. Berglund, Srinivasa R. Raghavan, Edo Waks, and Benjamin Shapiro, Nano Letters 10, 2525-2530 (2010)