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حالتهای ابرهمدوس دوفوتونی و بررسی درهمتنیدگی آنها

امین معتمدی نسب, داود افشار

Published Sep 23, 2018• 0 citations
OpenAlex

Abstract

Two photon supercoherent states are the eigenstates of square of the supersymmetric annihilation operator In this paper we investigate the entanglement of two classes of these states To this end orthogonal and normalized bosonic bases are introduced and supercoherent states would be transformed to the twoqubit ones with the use of them It is observed that twophoton supercoherent states are entangled and their entanglement depends on the coherency parameter unlike the onephoton supercoherent states The entanglement behavior of these two classes of states are different for large values of the coherency parameter However the maximum of fluctuation of entanglement occurs for both of these two classes in small values of coherency parameter

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هذیکچ –‎ ‎ مهزب‎هلاقم‎نیا‎رد ‎ ود‎شنک ‎ ‎ناذیم‎کی‎اب‎یسازتود‎متا کت ‎ذم ‎یطخزیغ ‎زک‎یاهزثا‎روضح‎رد کراتسا‎و ‎ ظاحل‎اب‎ار ندزک ‎ ‎یاهراذگ ینوتوفذنچ ‎ یطخزیغ‎میصر‎کی‎ رد ‎ د ظن‎ ر هتفزگز ‎ .میا هب‎ سا‎سپ تسد ‎ ازب‎یلیلحت‎باوج‎ندروآ ۀناماس‎ی ‎ متا ‎عبات‎کی‎باختنا‎ و‎ناذیم ،نیعم‎یطخزیغ ‎ یپوزتنآ ‎ یطخ ‎ هب‎ ار ناونع ‎ ناشیم ‎ مهرد ‎ ‎ناذیم‎ و‎متا‎نیب‎یگذینت یمرازق‎یسرزب‎ دروم ‎ میهد . ‎ ‎ رد ‎نیا ،شهوضپ ‎ ‎عبات‎کی یطخزیغ ‎ ‎هضیو ‎ار ‎یکیشیف‎ققحت‎ناونع‎هب ‎نیا ‎راتخاس هتفزگ‎زظن‎رد ‎ میا . ‎

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درهمتنیدگی حالتهای ابرهمدوس دوفوتونی

امین معتمدی نسب, داود افشار

انجمن اپتیک و فوتونیک ایران•Mar 10, 2019•0 citations

Entanglement of Non-symmetric Two Atomic Qubits Induced by a Coherent State Field

LI ., Jun-Gang, Zou +4 more

二原子 qubits 的纠纷，它被联合到一个协调状态与不同政变石楠删除，被学习。同时发生的动态进化，测量在二 qubits 之间的纠纷的度，被阴谋对放大 timegt。甚至当他们开始处于大多数混合状态被准备时，二 qubits 能由协调州的领域被纠缠，这被发现，并且为很弱的地，大多数混合状态能更容易比一些纯状态被纠缠。在 thequbits 之间的纠纷易感知地取决于原子政变石楠的相对差别和这块地的吝啬的光子数字，这也被发现。

理论物理通讯：英文版•Jan 1, 2006•1 citation
Two photon supercoherent states are the eigenstates of square of the supersymmetric annihilation operator In this paper we investigate the entanglement of two classes of these states To this end orthogonal and normalized bosonic bases are introduced and supercoherent states would be transformed to the twoqubit ones with the use of them It is observed that twophoton supercoherent states are entangled and their entanglement depends on the coherency parameter unlike the onephoton supercoherent states The entanglement behavior of these two classes of states are different for large values of the coherency parameter However the maximum of fluctuation of entanglement occurs for both of these two classes in small values of coherency parameter
The concept of a photon added two-mode Schrödinger cat state in which both modes are independent is introduced, and their nonclassical properties and entanglement are studied. The introduced states emerge as eigenstates of f 1 f 2 a 1 a 2 , where f 1 , f 2 are nonlinear functions of the number operator, and a 1 , a 2 are annihilation operators. We study the evolution of these states under canonical transformation using the parity operator for the case of standard coherent states of the harmonic oscillator. The nonclassical properties of these states are evaluated especially by considering sub-Poissonian photon statistics and photon number distribution. Interestingly, the addition of photons leads to shifting the region in which photon number distribution shows oscillatory behavior. In addition, the entanglement of introduced states is quantitatively analyzed using concurrence. We observe that the state approaches maximum entanglement more rapidly after the addition of photons.
هذیکچ –‎ ‎ مهزب‎هلاقم‎نیا‎رد ‎ ود‎شنک ‎ ‎ناذیم‎کی‎اب‎یسازتود‎متا کت ‎ذم ‎یطخزیغ ‎زک‎یاهزثا‎روضح‎رد کراتسا‎و ‎ ظاحل‎اب‎ار ندزک ‎ ‎یاهراذگ ینوتوفذنچ ‎ یطخزیغ‎میصر‎کی‎ رد ‎ د ظن‎ ر هتفزگز ‎ .میا هب‎ سا‎سپ تسد ‎ ازب‎یلیلحت‎باوج‎ندروآ ۀناماس‎ی ‎ متا ‎عبات‎کی‎باختنا‎ و‎ناذیم ،نیعم‎یطخزیغ ‎ یپوزتنآ ‎ یطخ ‎ هب‎ ار ناونع ‎ ناشیم ‎ مهرد ‎ ‎ناذیم‎ و‎متا‎نیب‎یگذینت یمرازق‎یسرزب‎ دروم ‎ میهد . ‎ ‎ رد ‎نیا ،شهوضپ ‎ ‎عبات‎کی یطخزیغ ‎ ‎هضیو ‎ار ‎یکیشیف‎ققحت‎ناونع‎هب ‎نیا ‎راتخاس هتفزگ‎زظن‎رد ‎ میا . ‎
The authors present the supercoherent states. They are introduced as the eigenstates of the supersymmetric annihilation operator of the quantum mechanical supersymmetric harmonic oscillator. They have a compact expression in terms of the standard (bosonic) coherent states. For each value of the complex parameter z there are two linearly independent orthogonal supercoherent states. One of them has pure fermionic character and is the more classical, while the other is fully supersymmetric (i.e. the mean value of the Klein operator when the system is set in this state vanishes). There are no purely bosonic supercoherent states. The supercoherent fermionic states saturate both the Heisenberg uncertainty relation and the new entropic uncertainty recently introduced by Deutsch (1983), while the supersymmetric ones almost (but not exactly) make it. They give a classical (or almost classical) mean value for the energy of the system and do not spread along their time evolution.
二原子 qubits 的纠纷，它被联合到一个协调状态与不同政变石楠删除，被学习。同时发生的动态进化，测量在二 qubits 之间的纠纷的度，被阴谋对放大 timegt。甚至当他们开始处于大多数混合状态被准备时，二 qubits 能由协调州的领域被纠缠，这被发现，并且为很弱的地，大多数混合状态能更容易比一些纯状态被纠缠。在 thequbits 之间的纠纷易感知地取决于原子政变石楠的相对差别和这块地的吝啬的光子数字，这也被发现。