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首页> 外文会议>NATO advanced research workshop on new trends in superconductivity >STUDY OF DECOHERENCE TIME OF ELECTRONIC STATES IN QUANTUM DOTS, JOSEPHSON JUNCTIONS AND FRACTIONAL QUANTUM HALL EFFECT 'PSEUDO-SPIN' QUANTUM COMPUTING DEVICES
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STUDY OF DECOHERENCE TIME OF ELECTRONIC STATES IN QUANTUM DOTS, JOSEPHSON JUNCTIONS AND FRACTIONAL QUANTUM HALL EFFECT 'PSEUDO-SPIN' QUANTUM COMPUTING DEVICES

机译：Quantum Dots，Josephson结和分数量子霍尔效应“伪旋转”量子计算装置的电子状态脱机时间研究

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The decoherence time with respect to the thermal phonon disturbance is theoretically studied in metal (or semiconductor) quantum dots, in superconducting junctions and in the FQHE system. For a quantum dot, the decoherence is so severe that the feasibility of the device in quantum computing is expected to appear at T < 10~(-6)K. Contrary to the prevailing expectation that Josephson-junction device has short decoherence time, we find that high quality junction may reveal a long τ_d at T < 0.5K comparable to τ_d of nuclear spin devices. On the other hand the unique property of FQHE system leads to the result that "1 electron state" suffers almost no thermal phonon disturbance so long as κ_BT is much lower than the cyclotron energy and quasiparticle excitation energy. A controlled NOT gate based on the ' "pseudo-spin" state is proposed, where both long decoherence time and fabrication feasibility are expected.
机译：理论上，在金属（或半导体）量子点，在超导结和FQHE系统中，理论上研究了相对于热敏源扰动的脱机时间。对于量子点，脱机是如此严重的是，预期在量子计算中的装置的可行性出现在T <10〜（6）k上。与Josephse-Junction装置具有短的脱机时间的普遍期望相反，我们发现高质量的结可以在与核自旋装置的τ_d相当的T <0.5k上揭示长τd。另一方面，FQHE系统的独特性能导致结果，即“1电子状态”几乎没有热声波扰动，只要κ_BT远低于回旋能量和Quasiparticle励磁能量即可。提出了一种基于“伪旋转”状态的受控的不栅极，其中期望长堵塞时间和制造可行性。

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