薛定谔猫态光场与多光子跃迁运动二能级原子相互作用系统的保真度
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摘要
利用全量子理论,研究了薛定谔猫态光场与多光子跃迁运动二能级原子相互作用系统的保真度.分别讨论了初始光强、原子运动速度、跃迁光子数以及薛定谔猫态中两宏观相干态的相位角等物理参量对系统保真度的影响.结果表明:随着初始光强的增大,量子态保真效果越来越差;当初始光强增大到一定程度时,偶相干态和奇相干态的保真度与时间演化特性相同;当跃迁光子数为奇数时,原子运动速度的增大使量子态保真效果更好.
The fidelity evolution in a system which is composed of a multi-photon transition moving two-level atom interacting with the Schrdinger cat state lighe field is studied by means of the full quantum theory.The influences of the strength of light field,the phase angle between the two coherent states,the atomic motion and the number of transition photon on the fidelity in a system are discussed.The results show that with increasing in the strength of light,the value of the fidelity is decreased.When the strength of light field is large enough,the fidelity of even coherent state and odd coherent state becomes equal,and the properties of fidelity evolvement are also the same.When the transitional photon number is odd,the fidelity of quantum state will be better with increasing in the velocity of atomic motion.
The fidelity evolution in a system which is composed of a multi-photon transition moving two-level atom interacting with the Schrdinger cat state lighe field is studied by means of the full quantum theory.The influences of the strength of light field,the phase angle between the two coherent states,the atomic motion and the number of transition photon on the fidelity in a system are discussed.The results show that with increasing in the strength of light,the value of the fidelity is decreased.When the strength of light field is large enough,the fidelity of even coherent state and odd coherent state becomes equal,and the properties of fidelity evolvement are also the same.When the transitional photon number is odd,the fidelity of quantum state will be better with increasing in the velocity of atomic motion.
引文
[1]SCHUMACHER B.Quantum Coding[J].Phys Rev A,1995,51:2738-2747.
[2]DUAN L M,GUO G C.Perturbative Expansions for the Fidelities and Spatially Correlated Dissipation of Quantum Bits[J].Phys Rev A,1997,56:4466-4470.
[3]HORODECKI R,HORODECKI M.Information-theoretic Aspects of Inseparability of Mixed States[J].Phys Rev A,1996,54:1838-1843.
[4]刘海燕,王继锁,梁宝龙.二项式光场与运动二能级原子相互作用系统的保真度[J].量子光学学报,2011,17(2):96-100.
[5]张彦立,史严,杨振军,等.二项式光场和原子相互作用模型中的保真度[J].河北师范大学学报:自然科学版,2005,29(3):357-360.
[6]刘海燕,王继锁,梁宝龙.热光场与运动二能级原子相互作用系统的保真度[J].聊城大学学报:自然科学版,2010,24(1):49-52.
[7]YURKE B,STOLER D.Generating Quantum Mechanical Super Positions of Macroscopically Distinguishable States via Amplitude Dispersion[J].Phys Rev Lett,1986,57(1):13-16.
[8]JOZSA R.Fidelity for Mixed Quantum States[J].J Mod Opt,1994,41(12):2315-2323.
[2]DUAN L M,GUO G C.Perturbative Expansions for the Fidelities and Spatially Correlated Dissipation of Quantum Bits[J].Phys Rev A,1997,56:4466-4470.
[3]HORODECKI R,HORODECKI M.Information-theoretic Aspects of Inseparability of Mixed States[J].Phys Rev A,1996,54:1838-1843.
[4]刘海燕,王继锁,梁宝龙.二项式光场与运动二能级原子相互作用系统的保真度[J].量子光学学报,2011,17(2):96-100.
[5]张彦立,史严,杨振军,等.二项式光场和原子相互作用模型中的保真度[J].河北师范大学学报:自然科学版,2005,29(3):357-360.
[6]刘海燕,王继锁,梁宝龙.热光场与运动二能级原子相互作用系统的保真度[J].聊城大学学报:自然科学版,2010,24(1):49-52.
[7]YURKE B,STOLER D.Generating Quantum Mechanical Super Positions of Macroscopically Distinguishable States via Amplitude Dispersion[J].Phys Rev Lett,1986,57(1):13-16.
[8]JOZSA R.Fidelity for Mixed Quantum States[J].J Mod Opt,1994,41(12):2315-2323.