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Chinese Journal of Quantum Electronics

Preparation of excited coherent states in high Q cavity

Fan Chao-yang

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

A new method was proposed to prepare excited coherent states and two-order excited coherent states,which is based on the interaction of atom inside high-Q cavity with a traveling wave light field. Compared with other presented methods,this method has some merits that the perturbation theory is not used and one step preparation is taken except for the final measurement.However,the success probability for this method is only 50%.

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A new method was proposed to prepare excited coherent states and two-order excited coherent states,which is based on the interaction of atom inside high-Q cavity with a traveling wave light field. Compared with other presented methods,this method has some merits that the perturbation theory is not used and one step preparation is taken except for the final measurement.However,the success probability for this method is only 50%.
Entanglment properties of photon-added two-mode entangled coherent states are analyzed and analytical expression of the concurrence entanglement is obtained.The results show that the concurrence of the photon-added entangled coherent states is very sensitive to the superposition phase.Schemes for preparation of photon-added coherent states and photon-added two-mode entangled coherent states are also proposed.The preparation procession of the photon-added coherent states is that the photon-added coherent states are firstly tansformed into a superposition state of coherent state and vacuum state(the superposition coefficient is associated with amplitude of the coherent state),then by applying the interaction of atom inside high-Q cavity with a classical light,finally added coherent states of cavity field is prepared.Preparation of photon-added two-mode entangled coherent states of cavity fields is based on interaction of the flying atom with two cavity fields.
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 method is presented for generating highly squeezed states of a cavity field via the atom-cavity field interaction of the Raman type. In the scheme a sequence of three-level -type atoms interacts with a cavity field, displaced by a classical source, in a Raman manner. Then the atomic states are measured. By this way the cavity field may collapse onto a superposition of several coherent states, which exhibits strong squeezing. The scheme can also be used to prepare superpositions of many two-mode coherent states for two cavity fields. The coherent states in each mode are on a straight line. This is the first way for preparing multi-component entangled coherent states of this type in cavity QED.