Accession Number : AD1025347

Title :   Optically Controlled Distributed Quantum Computing Using Atomic Ensembles As Qubits

Descriptive Note : Technical Report,15 Aug 2009,14 Aug 2015


Personal Author(s) : Shahriar,Selim M

Full Text :

Report Date : 23 Feb 2016

Pagination or Media Count : 126

Abstract : The goal of this project was to demonstrate the feasibility of realizing a large quantum computer by linking a series of elementary quantum computers (EQCs), using ensembles of atoms as qubits. We built all the tools for making an EQC.However, experimental work revealed that use of light shift imbalance only is not enough to achieve the required blockade. We have now shown why this is the case, and have identified how the blockade can be restored by using Rydberg interaction assisted light-shift imbalance. However, due to lack of necessary lasers, we were unable to demonstrate the EQC using this scheme. Instead, we focused on exploring other aspects of collective state entanglement for precision metrology. Specifically, we have shown how to realize spin-squeezed collective state atomic interferometer (COSAIN) and collective state atomic clock (COSAC), capable of improving the performance by a factor of root-N, thus reaching the Heisenberg limit. Significant experimental work has been carried out to demonstrate these devices, and this work will be carried to completion in the near future.

Descriptors :   Quantum Computing , Quantum Bits , atomic clocks

Subject Categories : Quantum Theory and Relativity
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE