Transport signatures of a Majorana qubit and read-out-induced dephasing

Transport signatures of a Majorana qubit and read-out-induced dephasing
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马约拉纳量子位的传输签名和读出引起的相移

DOI:
10.1088/1367-2630/ab1431
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发表时间:
2019-01
影响因子:
3.3
通讯作者:
Schoen Gerd
Schoen Gerd
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Qin Lupei;Li Xin Qi;Shnirman Alex;er;Schoen Gerd

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受最近提出的Majorana量子比特及其量子态的读出的启发,我们研究了由超导桥分流的两条平行拓扑线形成的量子比特设置。导线进一步耦合到两个量子点,这两个量子点也直接连接,从而产生干涉回路。通过该系统的传输电流示出了在QND测量中区分量子位的两个基态的干涉图案。我们分析了各种属性的干扰电流和读出过程中,包括所产生的失相和弛豫。我们还分析了不同的控制参数,如栅极电压对电流的影响。特征依赖性可以用作马约拉纳束缚态的签名。
Motivated by recent proposals of Majorana qubits and the read-out of their quantum state we investigate a qubit setup formed by two parallel topological wires shunted by a superconducting bridge. The wires are further coupled to two quantum dots, which are also linked directly, thus creating an interference loop. The transport current through this system shows an interference pattern which distinguishes two basis states of the qubit in a QND measurement. We analyze various properties of the interference current and the read-out process, including the resulting dephasing and relaxation. We also analyze the effects of varying control parameters such as gate voltages on the current. The characteristic dependencies may serve as a signature of Majorana bound states.
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