Optically Controlled Distributed Quantum Computing Using Atomic Ensembles As Qubits
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 23, 2016
- Accession Number
- AD1025347
Entities
People
- Selim M. Shahriar
Organizations
- Northwestern University