Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
For more information, contact Diego Dalvit.

February 9, 2006
12:30 PM

Michael G. Moore,
Ohio University

Deterministic, Long-Distance Teleportation of Atomic Qubits Via Optical Interferometry

Abstract

If quantum computers using stationary qubits, e.g. atoms, ions, or quantum dots, are successfully developed, the problem of transmitting qubits from one processor to another will need to be addressed in order to build true quantum information networks. As the physical qubits themselves cannot be easily transported, it will be necessary to teleport the quantum state from one physical qubit to another. We have developed a new procedure for long-distance qubit teleportation in which optical interferometry with ordinary laser light is used to entangle two distant qubits, with conditional single-qubit operations resulting in deterministic transfer of an arbitrary quantum state from one qubit to another. No direct interaction between qubits is necessary. I will discuss fundamental limitations due to decoherence and interferometery sensitivity, as well the advantages of cavity enhancement and/or non-classical photon input states. The protocol is generally tolerant of photon losses, and using existing technology could function with an error rate of 0.1%. The possible use of 'Schrodinger cat' many-atom states as qubits will also be discussed briefly.