Quantum Communication and Computing With Atomic Ensembles Using Light-Shift Imbalance Induced Blockade

Abstract

Recently, we have shown that for conditions under which the so-called light-shift imbalance induced blockade (LSIIB) occurs, the collective excitation of an ensemble of a multi-level atom can be treated as a closed two level system. In this paper, we describe how such a system can be used as a quantum bit (qubit) for quantum communication and quantum computing. Specifically, we show how to realize a C-NOT gate using the collective qubit and an easily accessible ring cavity, via an extension of the so-called Pellizzari scheme. We also describe how multiple, small-scale quantum computers realized using these qubits can be linked effectively for implementing a quantum internet. We describe the details of the energy levels and transitions in 87Rb atom that could be used for implementing these schemes.

16 pages, 9 figures. Accepted in Phys. Rev. A

References in corpus (8)

• Long-distance quantum communication with atomic ensembles and linear optics
• Cavity QED with optically transported atoms
• Microoptical Realization of Arrays of Selectively Addressable Dipole Traps: A Scalable Configuration for Quantum Computation with Atomic Qubits
• Three-dimensional theory for interaction between atomic ensembles and free-space light
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• Single atoms in a standing-wave dipole trap
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• Rydberg assisted light shift imbalance induced blockade in an atomic ensemble
• Encoded Universality of Quantum Computations on the Multi-Atomic Ensembles in the QED Cavity
• Fast and robust two- and three-qubit swapping gates on multi-atomic ensembles in quantum electrodynamic cavity
• Quantum Computing on Multi-atomic Ensembles in Quantum Electrodynamics Cavity
• Quantum computer with atomic logical qubits encoded on macroscopic three-level systems in common quantum electrodynamic cavity