Department of Applied Physics

Description

Nanoscience and Quantum Engineering

Optically controlled electron spins for fault-tolerant quantum computing architecture. Ultra-fast single qubit and two qubit gates based on semiconductor microcavity quantum dots and broadband optical pulses. Decoherence time increased by optical spin echo techniques. Entanglement distribution based on generation and detection of indistinguishable single photons.

Condensed Matter Physics

Dynamical condensation and superfluidity of exciton polaritons. BKT phase transition and BCS crossover. Quantized vortex-pairs and Bogoliubov excitation spectrum. Quantum simulation of Ising model and Hubbard model with exciton polariton condensate arrays and injection-locked lasers.

Courses Taught

• Fundamentals of Noise Processes
• Quantum Optics and Measurements
• Physics of Quantum Information
• Quantum Device Physics of Atomic and Semiconductor Systems

Selected Publications

• Indistinguishable Photons from a Single-Photon Device
• Condensation of Semiconductor Microcavity Exciton Polaritons
• A gallium nitride single-photon source operating at 200 K
• Quantum key distribution over 40 dB channel loss using superconducting single photon detectors
• Coherent zero-state and π-state in an exciton-polariton condensate array
• Observation of Bogoliubov excitations in exciton-polariton condensates
• Ultrafast control of donor-bound electron spins with single detuned optical pulses
• Complete quantum control of a single quantum dot spin using ultrafast optical pulses
• Ultrafast Optical Spin Echo in a Single Quantum Dot
• Exciton-polariton Bose-einstein condensation