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理论物理通讯：英文版

Quantum Information Transfer from a Double Quantum Dot System to a Cavity Field

谭庆收, 董勇, 匡乐满

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

在这份报纸，我们建议一个计划从一个双量点(DQD ) 认识到量信息转移系统到一块使量子化的洞地。DQD 和洞地分别地被当作二状态的费用 qubit 和一个连续变量的系统。编码为二状态的 DQD 系统的量信息能关于 DQD 通过适当射影的大小与一个连续变量的基础被转移到洞地的量状态，这被显示出。

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arXiv:1401.2614•IEEE Journal of Quantum Electronics•Jun 8, 2015•14 citations
在这份报纸，我们建议一个计划从一个双量点(DQD ) 认识到量信息转移系统到一块使量子化的洞地。DQD 和洞地分别地被当作二状态的费用 qubit 和一个连续变量的系统。编码为二状态的 DQD 系统的量信息能关于 DQD 通过适当射影的大小与一个连续变量的基础被转移到洞地的量状态，这被显示出。
在这篇论文，我们调查一个双量点(DQD ) 的 decoherence 时间在通过解决 qubit 的动力学的三种洗澡的费用 qubit。qubit 的动力学与 Redfield 主人方程被调查。在欧姆的洗澡的 qubit 的 decoherence 时间把象实验的一样的数量级报导，这被显示出。当环境与在上被建模时 -- 欧姆的洗澡 qubit 的 decoherence 时间比试验性的结果短。并且当与亚 Ohmic 洗澡当模特儿时， qubit 的 decoherence 时间比试验性的结果长。
PACS. 73.23.-b – Electronic transport in mesoscopic systems. Abstract. – We study entanglement of charge qubits in a vertical tunnel-coupled double quantum dot containing two interacting electrons. Exact diagonalization is used to compute the negativity characterizing entanglement. We find that entanglement can be efficiently generated and controlled by sidegate voltages, and describe how it can be detected. For large enough tunnel coupling, the negativity shows a pronounced maximum at an intermediate interaction strength within the Wigner molecule regime. Semiconductor few-electron quantum dots (QDs) continue to attract a lot of interest, as it has now become possible to experimentally control both the electronic spin and charge in a condensed-phase environment in an unprecedented manner. In particular, double quantum dots (DQDs) can be fabricated in a well-controlled fashion in high-quality semiconductor devices, and are currently under intense study [1–9]. Vertical or lateral tunnel-coupled DQDs are among the most promising candidates for realizing spin or charge qubits in a quantum information processor [10–12]. Their main advantages are scalability, good control of physical properties via tunable external (sidegate-) voltages or magnetic fields, and spatial separation
我们为零的一件二模式的纠纷转建议一个计划 -- 纠缠的 orone 光子在二之间声明经由原子洞的洞回答反响的相互作用。在我们的建议，以便转移纠缠的状态，我们仅仅为收到电视需要二个相同二水平的原子和 atwo 模式洞移植状态。这个计划不要求 Bell-statemeasurement 并且执行任何转变重建起始的状态。并且转移能以一种简单方式与 100% 成功概率发生。并且为在洞之间州的纠缠的 atwo 模式转的一个网络被建议。这个计划能也被扩大转移洞州的纠缠的 N 模式。
For a two-level double quantum-dot (DQD) system, we proposed an alternative ultrafast manipulation approach, Lyapunov-based control method, to transfer the charge qubit from the initial charge state |R) to the target charge state |L) on the picosecond scale. Better control performance is obtained compared with that via Landau-Zener-Stu̅ckberge-Majorana interference, and the designed control fields can be implemented in the actual experiment facility. The control process is composed of three parts: first, a slope pulse takes the system from a positive detuning adiabatically to the anticrossing point, which corresponds to the resonance state of the system; then, a Lyapunov-based control pulse drives the charge qubit transfer nonadiabatically; finally, another slope pulse takes the system away from the anticrossing point to keep the system stable. The charge qubit transfer performance and the function of Lyapunov-based control pulse were studied under different control parameters. Simulation results showed that the designed Lyapunov-based control pulse has a rise time ~20 ps, which is in the scope of the Tektronix AWG70000A series arbitrary waveform generator and results in a significant probability ~96% for the transition from the initial charge state |R) to the target charge state |L). The fidelity of the control process designed can achieve ~94%. This is the first result directly applicable for a DQD charge qubit transfer using the Lyapunov-based control method.