超短激光脉冲操控双量子比特的量子态

Two-qubit Quantum State Controlled by Ultra-short Pulse

用光与物质相互作用的半经典理论研究了超短激光脉冲与构成双量子比特的二体二能级体系的相互作用,对由不同的激发方式引起的独立双路(Independent Double Path-Ways,IDPW)和相干双路径(Coherent Double Path-Ways,CDPW)进行对比.研究结果表明,与单量子比特相比,双量子比特在超短激光脉冲的作用下,表现出更加丰富的相干性.这种相干特性与体系初态、失谐量和激发的路径都有关.同时,可以利用超短激光脉冲对双量子比特的相干激发,通过调节光脉冲面积来实现量子态的操控.

The semi-classical theory of the interaction between light and matter was applied to the study of the interaction of ultra-short pulse with the two two-level system. A comparison was made between the independent double path-ways （IDPW） and the coherent double path-ways （CDPW） driven in different ways. It is suggested that compared with single qubit,the two qubits shows a higher property of coherence when interacted with the ultra-short pulse. This property of coherence is related to the initial state of the system,the detuning, and the driving path ways. And, it is demonstrated that with the presented model quantum state operation can be made through the modulation of the pulse area.