Two-photon interference of the emission from electrically tunable remote quantum dots
Two-photon interference of the emission from electrically tunable remote quantum dots
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DOI：
10.1038/nphoton.2010.161
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发表时间：
2010-09-01
期刊：
影响因子：
35
通讯作者：
Shields, Andrew J.
中科院分区：
文献类型：
--
作者：
Patel, Raj B.;Bennett, Anthony J.;Shields, Andrew J.
自组装量子点构成了一个研究固态量子效应的通用系统。许多设备已经被开发出来，证明了量子点的可控充电(1)、拉比振荡(2)、相干自旋控制(3)和电注入的非经典光子发射(4)。量子点通常被称为“人造原子”，具有离散的能级，使其成为编码量子比特的可行候选。然而，与单个原子不同，没有两个量子点是相同的。对于量子信息应用来说，这是一个复杂的问题，因为量子信息应用需要在相同状态下初始化量子比特，以及由难以区分的光子介导的远程系统之间的相互作用。我们报告说，真正遥远的、独立的量子点可以通过大的外加电场调谐到相同的能量。这使得它们在偶合门控下发射的双光子干涉(5)成为可能，并开辟了在远程固态源之间传输量子信息的可能性。
Self-assembled quantum dots comprise a versatile system with which to study quantum effects in the solid state. Many devices have been developed that demonstrate controlled charging of a quantum dot(1), Rabi oscillations(2), coherent spin control(3) and electrically injected non-classical photon emission(4). Often referred to as 'artificial atoms', quantum dots have discrete energy levels, making them a viable candidate for encoding qubits. However, unlike single atoms, no two quantum dots are alike. This is a complication for quantum-information applications that require qubits initialized in the same state and interactions between remote systems mediated by indistinguishable photons. We report that truly remote, independent, quantum dots can be tuned to the same energy using large applied electric fields. This allows two-photon interference(5) of their emission under coincidence gating and opens up the possibility of transferring quantum information between remote solid-state sources.