Towards optical quantum information processing using impurities in solids

Date: 
Monday, November 6, 2006 (All day)
Speaker: 
Dr. Charles Santori

Towards optical quantum information processing using impurities in solids

 

Electronic spins in solids have attracted much interest as potential quantum bits (qubits) for quantum information processing due to their long-lived coherence.  The most difficult challenge is how to couple spins to each other in a precise, controllable way.  One approach which appears to be scalable and offers a degree of tolerance to fabrication defects is to manipulate the spins optically and connect them through a photonic network.  However, to avoid information loss, this approach requires efficient coupling of an optical transition to a single-mode waveguide.

 

In this talk I will discuss the suitability of several solid-state systems for use in photonic quantum networks with emphasis on nitrogen-vacancy (NV) centers in diamond.  Initialization and readout of the spin state of single NV centers has already been demonstrated.  Using two-laser spectroscopy we have shown that this defect also can provide a three-level “Lambda” configuration as needed for all-optical spin manipulation and inter-conversion between spin and photonic qubits.  Finally I will describe our current efforts to couple NV centers to optical microcavities.