分析和微分方程讨论班

报告题目：Perfect pure quantum state transfer via state restoring and ancilla measurement

报  告  人：Alexander Z.(Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS,  Russian)

时        间：2026年3月20日(星期五)，下午15:00-16:00

地        点：海纳苑2幢102

摘  要：We propose the probabilistic protocol for perfect state transfer of an arbitrary pure quantum state along the spin-1/2 chain governed by the Hamiltonian preserving the excitation number in the system.  We show that the k-excitation pure sender's state can be restored at the receiver using only the local unitary transformation U over the qubits of the extended receiver. The restored state appears in the superposition with other states which form garbage. This garbage can be easily removed by including the ancilla, whose state labels the garbage, and then  measuring the ancilla state with desired output. The resulting state of the receiver coincides with the initial sender's state. The probability of the desired output of ancilla measurement (success probability) can be maximized using  parameters of the above unitary transformation U. It is important that this optimization can be done analytically by solving  certain polynomial equation. An arbitrary pure state can be perfectly transferred by encoding it into the k-excitation state of the sender and then decoding the perfectly transferred k-excitation state at the receiver side.

联系人：武俊德(wjd@zju.edu.cn)