Prospects for photon blockade in four-level systems in the N configuration with more than one atom

Greentree, Andrew D.; Vaccaro, John A.; Echaniz, S. R. de; Durrant, A.V.; Marangos, J. P.

doi:10.1088/1464-4266/2/3/306

Cited by 39 publications

(25 citation statements)

References 16 publications

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“…We have extended this investigation up to the case of N = 4. These results, obtained for values of the involved parameters achievable by current technology [25], are in agreement with the analysis in [26].…”

Section: Bi-chromatic Photon Blockadesupporting

confidence: 89%

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Perspectives for quantum state engineering via high nonlinearity in a double-EIT regime

Paternostro

Kim

Ham

2003

Journal of Modern Optics

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We analyse the possibilities for quantum state engineering offered by a model for Kerr-type nonlinearity enhanced by electromagnetically induced transparency (EIT), which was recently proposed by Petrosyan and Kurizki [Phys. Rev. A 65, 33833 (2002)]. We go beyond the semiclassical treatment and derive a quantum version of the model with both a full Hamiltonian approach and an analysis in terms of dressed states. The preparation of an entangled coherent state via a crossphase modulation effect is demonstrated. We briefly show that the violation of locality for such an entangled coherent state is robust against low detection efficiency. Finally, we investigate the possibility of a bi-chromatic photon blockade realized via the interaction of a low density beam of atoms with a bi-modal electromagnetic cavity which is externally driven. We show the effectiveness of the blockade effect even when more than a single atom is inside the cavity. The possibility to control two different cavity modes allows some insights into the generation of an entangled state of cavity modes.

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Section: Bi-chromatic Photon Blockadesupporting

confidence: 89%

“…A mono-chromatic photon blockade effect results, as studied in Ref. [5,24,26]. Once a photon in E ext a leaks into the cavity and feeds E a , no other external photons are allowed to enter (the photons are blocked).…”

Section: Bi-chromatic Photon Blockadementioning

confidence: 99%

Perspectives for quantum state engineering via high nonlinearity in a double-EIT regime

Paternostro

Kim

Ham

2003

Journal of Modern Optics

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“…Improvements by many orders of magnitude with respect to conventional nonlinearities have indeed been observed in this way [17]. In addition, strong cross-phase modulation [16] and photon blockade (i.e., strong self-phase modulation) have also been predicted [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 74%

Polarization phase gate with a tripod atomic system

et al. 2004

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We analyze the nonlinear optical response of a four-level atomic system driven into a tripod configuration. The large cross-Kerr nonlinearities that occur in such a system are shown to produce nonlinear phase shifts of order . Such a substantial shift may be observed in a cold atomic gas in a magneto-optical trap where it could be feasibly exploited towards the realization of a polarization quantum phase gate. The experimental feasibility of such a gate is here examined in detail.

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“…For weak to moderate driving, the EITKerr system is well-approximated by a two-state system, corresponding to the two lowest lying polariton eigenstates. How this behaviour changes with the introduction of additional atoms was investigated by Werner and Imamoglu [15] (see also the work of Greentree et al [16]). …”

Section: Introductionmentioning

confidence: 99%

Polariton analysis of a four-level atom strongly coupled to a cavity mode

2002

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We present a complete analytical solution for a single four-level atom strongly coupled to a cavity field mode and driven by external coherent laser fields. The four-level atomic system consists of a three-level subsystem in an EIT configuration, plus an additional atomic level; this system has been predicted to exhibit a photon blockade effect. The solution is presented in terms of polaritons. An effective Hamiltonian obtained by this procedure is analyzed from the viewpoint of an effective two-level system, and the dynamic Stark splitting of dressed states is discussed. The fluorescence spectrum of light exiting the cavity mode is analyzed and relevant transitions identified.

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Prospects for photon blockade in four-level systems in the N configuration with more than one atom

Cited by 39 publications

References 16 publications

Perspectives for quantum state engineering via high nonlinearity in a double-EIT regime

Perspectives for quantum state engineering via high nonlinearity in a double-EIT regime

Polarization phase gate with a tripod atomic system

Polariton analysis of a four-level atom strongly coupled to a cavity mode

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