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Chinese journal of atomic and molecular physics

The unequal-power higher-power differencesqueezing in the multimode Schrodinger-cat state entangledlight field with three macroscopically distinguishablequantum states superposition

Wang Ju-xia

Published Jan 1, 2004• 0 citations
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Abstract

By utilizing the general theory of multimode squeezed states, the effects of generalized nonlinear unequal-power higher-power difference in the multimode Schrodinger-cat state entangled light field is studied, that is formed by the linear superposition of three macroscopical distinguishable quantum states named the multimode complex conjugate coherent state, multimode complex conjugate imaginary coherent state and multimode vacuum state. It is found that 1) the difference of the cat state entangled light field is independent of its vacuum state component; 2) in some cases, the two quadrature phase components of this cat state entangled light field present unequal-power higher-power difference properties respectively ; 3) under some other conditions, the difference effects of two quadrature phase components of the state mentioned above can exist at the same time. The two preceding results stated above are in conformity with the uncertainty principle, but the last is not. It is called two-sided difference squeezing phenomenon and could be very useful in the application of squeezed light on light quanta communication.

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Journal of Yanan University•Jan 1, 2004•0 citations
By utilizing the general theory of multimode squeezed states, the effects of generalized nonlinear unequal-power higher-power difference in the multimode Schrodinger-cat state entangled light field is studied, that is formed by the linear superposition of three macroscopical distinguishable quantum states named the multimode complex conjugate coherent state, multimode complex conjugate imaginary coherent state and multimode vacuum state. It is found that 1) the difference of the cat state entangled light field is independent of its vacuum state component; 2) in some cases, the two quadrature phase components of this cat state entangled light field present unequal-power higher-power difference properties respectively ; 3) under some other conditions, the difference effects of two quadrature phase components of the state mentioned above can exist at the same time. The two preceding results stated above are in conformity with the uncertainty principle, but the last is not. It is called two-sided difference squeezing phenomenon and could be very useful in the application of squeezed light on light quanta communication.
By using the general theory of multimode squeezed states, the difference of generalized nonlinear unequal - power higher - power in the multimode Schrodinger -cat state entangled light field is studied in detail. This light field is formed by linear superposition from three quantum states, i.e. multimode complex conjugation coherent state, multimode complex conjugation imaginary coherent state and multimode vacuum state. The conclusion shows that 1) the difference of the cat state entangled light field is independent of the vacuum state; 2) when certain conditions are satisfied, the two quadrature phases of this cat state entangled light field present unequal - power higher - power difference properties respectively, and under some other conditions, the difference effects of two quadrature phases can be displayed at the same time. The former is in conformity with the uncertainty principle. But the later is not, and is called two-sides difference squeezing considering the application of squeezed light in the light communication.
The properties of equal-higher-power difference squeezing of multimode entangled state light - field composed of multimode complex conjugate coherent state, multimode complex conjugate imaginary coherent state and multimode vacuum state are studied by utilizing the multimode squeezing theory in decoherence. The results show that when some fixed conditions are satisfied the mixed entangled state light - field mentioned above not only has the equal - higher - power difference squeezing in one of the quadratures but also displays the similar effects in the quadratures simultaneously, that is called two - sided difference squeezing. This is a newly physical phenomenon which contradicts the principle of uncertainty.
According to the principle of linear superposition of quantum mechanics, the multimode entangled states (as stated below) is formed on the finite-dimensional(N+1) Hilbert space by linearly superposing three quantum states: the multimode complex conjugate coherent state (as stated below), multimode complex conjugate imaginary coherent state (as stated below) and multimode vacuum state (as stated below), and their difference squeezing properties of generalized nonlinear equal-power N-th power is studied by utilizing the general theory of multimode squeezed states. The results show that on the finite -dimensional Hilbert space, while some conditions are satisfied, the two quadratures of the multimode entangled states (as stated below) present the equal-power N-th power difference squeezing properties, but under some other conditions, the difference squeezing effects of two quadratures can be displayed at the same time. The squeezed depth or squeezed degree in this space is different from that on the full-dimensional Hilbert space. The later result is not in conformity with the uncertainty principle. It is called "two -sided〞difference squeezing.
According to the principle of linear suporposition of quantum mechanics,the multimode entangled states ｜｛Ψ~((3))_(2q) is formed by linearly superposing three quantum states: the multimode complex conjugate coherent state ｜｛iZ~_j｝_(2q),multimode complex conjugate imaginary coherent state ｜｛iZ~_j｝_(2q) and multimode vacuum state ｜｛0_j｝_(2q) on the finite-dimensional(N+l) Hilbert space.and their difference squeezing properties of generalized nonlinear equal-power N-th power is studied by utilizing the general theory of multimode squeezed states.The results show that on the finite-dimensional Hilbert space,while some conditions are satisfied,the two quadratures of the state ｜Ψ~((3))_(2q) present the equal-power N-th power difference squeezing properties,but under some other conditions,the difference squeezing effects of two quadratures can be displayed at the same time,and the squeezed depth or squeezed degree in this space is different from that on the full-dimensional Hilbert space.It is called two-sided difference squeezing.
According to the linear superposition principle of state in quantum mechanics,the three state superposi-tion multimode Schr dinger-Cat State light-field,namely,multimode SCS light-field) │ Ψ ,3) q is constructed,which is composed of multimode complex conjugation imaginary coherent state,the contrary state of multimode complex conjugation imaginary coherent state,and multimode complex conjugation coherent state.The multimode squeezed state theory established recently by pro fessor Yang Zhiyong and academician Hou Xun is utilized to study the char-acteristics of generalized nonlinear unequal-power higher-power sum squeezing of the generalized electric-field com-ponent in the multimode SCS light-field │ Ψ ,3) q mentioned above in detail.The results show that under the condi-tion of the sum of squeezing-power-number for every mode being an even number,while some other fixed conditions are respectively satisfied by the sum of the products between the squeezing-power-number of each mode and the ini-tial phase which is in accordance with each mode above,by the interstate initial phase difference,and by the mean photon-number of each multimode coherent state light-field,the generalized electric-field component of the multi-mode SCS light-field │ Ψ ,3) q can always display the effects of any N j -th power generalized nonlinear unequal-power higher-power sum squeezing that change periodically and alternatively.
It was constructed firstly that the three-states superposition multimode functional superposition state light-field|ψ~((3))_f_q was made up of the two different multimode complex conjugate functional coherent state |{f~(((a))~*)_j(x,y,z)}_q and |{f~(((b))~*)_j(x,y,z)}_q which had rather different spatial intensity distribution characteristics and the multimode vacuum state |{0_j}_q according to the linear superposition principle of quantum state in quantum mechanics. And then the multimode squeezed state theory was utilized to study the effects of generalized nonlinear unequal-power higher-power Y-squeezing of generalized magnetic-field component in the state|ψ~((3))_f_q. It was shown that under a series of fixed conditions,the generalized magnetic-field component of the state|ψ~((3))_f_q can always display the effects of generalized nonlinear unequal-power higher-power Y-squeezing which changes periodically and alternatively; the any asymmetrical spatial distribution profile of the classical intensity and the classical amplitude,and the any spatial distribution features of the initial classical phase of the quantum light-field state|ψ~((3))_f_q would have a direct influence upon the squeezed degree and squeezed depth of generalized nonlinear unequal-power higher-power Y-squeezing present by the generalized magnetic-field component in the state |ψ~((3))_f_q.