二比特量子信息在任意格点数自旋链上完美传输的调控

Control on the Two-Qubit Information Perfect Transfer in the Spin Chain with the Arbitrary Lattice Point Number

利用近邻格点磁感应强度差值为B/2且中心对称的弱磁场,可以实现格点数N=3自旋链上二比特量子信息完美传输的量子调控。以此为依据,研究了这种特定磁场分布对二比特量子信息在N=4、N=5自旋链上完美传输的影响,并将其推广至任意格点数自旋链的情形。结果表明:实现完美传输的时间条件取决于磁场近邻格点间的磁感应强度差值,而与自旋链的格点数无关。基于此,提出了实现任意格点数自旋链上二比特信息传输的量子调控方案:通过调节近邻格点磁感应强度差值的大小,可以调控信息完美传输的时间条件。

By applying a centrally symmetric weak magnetic field,in which the magnetic intensity difference between the neighboring lattice points is B/2,the two-qubit information perfect transfer in the spin chain with the lattice number N=3 can be achieved.The influence of this specific magnetic field distribution on the two-qubit information perfect transfer in the N=4 and N=5 spin chains are also respectively studied.Besides,the investigation is also extended to the spin chain with the arbitrary lattice point number.The results indicate that the time condition to achieve the perfect transfer depends on the magnetic induction intensity difference,and has no relation with the lattice number of the chain.Based on this,the quantum control scheme of the two-qubit information transfer in the spin chain with the arbitrary lattice point number is proposed:By adjusting the magnetic induction intensity difference between the neighboring lattice points,the time conditions of quantum information perfect transfer can be manipulated.