Quantum information processing and cavity QED with quantum dots in photonic crystals

Goals:

To develop on-chip "quantum networks" consisting of quantum dots (QDs) positioned in photonic crystal cavities (PCCs) and linked by waveguide structures for quantum information processing applications.
To investigate fundamental light-matter interactions within the context of quantum optics and coherent control in solid state systems

Quantum computers, i.e. computers whose computational operations rely on quantum mechanical phenomena such as quantum superposition and entanglement, would be able to perform computational tasks such as database searching, factoring and simulating quantum systems much more efficiently than a classical computer.
Quantum communication would enable the transmission of information in a manner that makes eavesdropping essentially impossible to achieve, guaranteeing secure communication.

On-demand, deterministic generation of single photons.
Controlling of the QD charge state and transition energy via an external bias voltage.
The development and implementation of a high-fidelity QD spin initialization scheme.
The fabrication of polarization-degenerate PCCs to enable the optical coupling of circularly polarized light.
The development of a spin-selective read-out scheme for a singly-charged QD strongly coupled to a PCC.

Coherent spectroscopy of quantum dot via incoherently coupled off-resonant cavity (Paper)
Off-resonant phonon mediated coupling between quantum dot and photonic crystal cavity (Paper)
Proposal for generation of nonclassical states of light via photon blockade in optical nanocavities (Paper)
Differential reflection spectrocopy of a single quantum dot strongly coupled to a photonic crystal cavity (Paper)
Micron-scale electrical heaters for controlling QD resonances with respect to PCC resonances. (Paper)
Demonstration of dipole-induced transparency through a PCC weakly coupled to a QD. (Paper)
Demonstration of controlled phase shifts of light in a coupled QD-PCC system. (Paper)
Generation of non-classical light in a strongly-coupled QD-PCC system via photon-induced tunneling and blockade. (Paper)
Control of PCC resonances by laser-induced photodarkening of deposited chalcogenide glass layers. (Paper)
Demonstration of the use of a QD strongly coupled to a PCC to control of the amount light reflected by the PCC. (Paper)
Demonstration of local temperature control of QD transition energies via fabricated heating pads. (Paper)

last modified on Thursday November 10, 2011