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Optik

Squeezing and photon number properties of two-mode squeezed lights with a V-type three-level atom

Gomera Biyazn, Misrak Getahun

Published May 10, 2025• 1 citation
Publisher
DOI
10.1016/j.ijleo.2025.172371

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Effects of opto-mechanical cavity and squeezed vacuum reservoir on V-type three level-laser

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The Properties of light generated by V-type three-level laser in a doubly resonant opto-mechanical cavity coupled to squeezed vacuum reservoir have been studied. The atoms injected into the laser cavity are initially prepared in a coherent superposition of the two upper levels. Employing the expectation values of the cavity mode variables at steady state , the variances of quadratures and EPR-like variables of the cavity light modes have been determined. The results show that the two-mode cavity light exhibits squeezing in the minus quadrature and entanglement for small values of linear gain coefficient of the atom. The opto-mechanical coupling strength and cavity size diminish the squeezing and entanglement properties, even though these quantities have no effect on the mean photon number of the cavity modes. Moreover, 87.8% of quadrature squeezing below the vacuum state is obtained.

Results in Optics•Jun 4, 2025•0 citations
When neglecting and considering the interaction between atoms,the quadrature squeezing and the photon-number squeezing of Bose-Einstein Condensate of V-type three level atoms interacting with two-mode squeezed light field are studied.The results show that the quadrature squeezing dependent on squeezing parameter and the photon-number squeezing is closely correlated to squeezing parameter and light field intensity.It is found that the two kinds of squeezing can be obtained at some conditions.and the interaction between atoms in BEC changes the period of fluctuation of light field and the amplitude of fluctuation of quadrature component.However,such atom-atom interaction does not affect the amplitude of fluctuation of photon-number squeezing.
The squeezing, entanglement, and statistical properties of light produced by lambda-type three-level laser coupled to squeezed vacuum reservoir have been studied. We have determined the quadrature variances mean as well as variance photon number photon for cavity modes with the aid of the solutions of c-number Langevin equations associated with the normal order. The results show that the light produced by the system under consideration in squeezed state. The squeezed vacuum reservoir enhances both the quadrature squeezing and mean photon numbers. In addition, the mean photon number of mode b is greater than that of a if more atoms injected with state |a>. We have calculated the quadrature variances of the cavity modes, the result shows that the light produced by the system under consideration is in squeezed state and the squeezing occurs in the minus quadrature. The result also shows that the effect of the squeezed vacuum reservoir is not only enhancing the degree of squeezing for the light modes but also to generate the photons for the system under consideration. The system produce entangled two mode light that increase with η and linear gain coefficient but decrease with squeezing parameters. The correlation function of the two modes decreases as η, the linear gain coefficient and increase with squeezing parameter.
The Properties of light generated by V-type three-level laser in a doubly resonant opto-mechanical cavity coupled to squeezed vacuum reservoir have been studied. The atoms injected into the laser cavity are initially prepared in a coherent superposition of the two upper levels. Employing the expectation values of the cavity mode variables at steady state , the variances of quadratures and EPR-like variables of the cavity light modes have been determined. The results show that the two-mode cavity light exhibits squeezing in the minus quadrature and entanglement for small values of linear gain coefficient of the atom. The opto-mechanical coupling strength and cavity size diminish the squeezing and entanglement properties, even though these quantities have no effect on the mean photon number of the cavity modes. Moreover, 87.8% of quadrature squeezing below the vacuum state is obtained.