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Journal of Physics B Atomic Molecular and Optical Physics

A scheme for generating two-photon and three-photon states of a cavity field using resonant single atoms

Shi-Biao Zheng

Published Feb 27, 2002• 1 citation
Publisher

Abstract

We propose a scheme for generating two-photon states for a cavity field. In the scheme the cavity initially contains a small coherent or thermal field. Then a resonant two-level atom is sent through the cavity. After an appropriate interaction time the atom is state-selectively measured, which may collapse the cavity field onto a two-photon state. A three-photon state of rather high fidelity can also be generated with a single atom.

DOI
10.1088/0953-4075/35/5/309

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We propose a scheme for generating two-photon states for a cavity field. In the scheme the cavity initially contains a small coherent or thermal field. Then a resonant two-level atom is sent through the cavity. After an appropriate interaction time the atom is state-selectively measured, which may collapse the cavity field onto a two-photon state. A three-photon state of rather high fidelity can also be generated with a single atom.
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A single two-level atom can be used to prepare an arbitrary photon number state (Fock state) in a high Q cavity . The atom undergoes a controlled succession of interactions with two cavity modes. One of them contains a coherent field. The atom transfers photons one by one from this field to the initially empty second mode. The scheme can be extended to prepare a quantum superposition of the vacuum with a Fock state, a highly non-classical situation. We discuss the feasibility of the experiment with our present Rydberg-atom cavity QED set-up.
A simple scheme is presented for generating n atom W states with the two-photon resonant interaction between atoms and cavity field.In the proposed protocol,it is injected a two-level atom initially prepared in the excited state through the cavity prepared in the vacuum state.The other two-level atoms prepared in the ground state are injected into cavity.Because the interaction between the atoms and cavity field is resonant,the coupling strength can be relatively strong which will shorten the corresponding interaction time and thus reduce the effect of decoherence in experiment.