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Single atom transistor in a 1D optical lattice.

A Micheli¹, A J Daley, D Jaksch

¹Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria.

Physical Review Letters

|November 5, 2004

Summary

We developed a quantum interference method to control atom transport in optical lattices. This technique enables a qubit impurity atom to act as a switch, allowing for quantum nondemolition measurements.

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Area of Science:

Quantum physics
Atomic physics
Quantum optics

Background:

Optical lattices are crucial for quantum simulations and atom manipulation.
Controlling atom transport with single impurity atoms is challenging.
Quantum nondemolition measurement is essential for quantum information processing.

Purpose of the Study:

To propose a novel scheme for controlling atom transport in a 1D optical lattice.
To demonstrate how an impurity atom can function as a qubit for controlling probe atom transport.
To enable single-shot quantum nondemolition measurement of the qubit's spin state.

Main Methods:

Utilizing quantum interference phenomena.
Employing a 1D optical lattice with an impurity atom.

Related Experiment Videos

Engineering the impurity atom's spin-dependent interaction with probe atoms.

Main Results:

The impurity atom acts as a switch, being transparent in one spin state and a mirror in the other.
Atom transport through the lattice can be precisely controlled by the qubit's spin.
A single-shot quantum nondemolition measurement of the qubit spin is achieved.

Conclusions:

The proposed scheme offers a new method for controlling quantum transport.
This technique provides a pathway for high-fidelity qubit readout.
The findings have implications for quantum computing and quantum metrology.