A quantum logic gate between a solid-state quantum bit and a photon
A quantum logic gate between a solid-state quantum bit and a photon
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DOI：
10.1038/nphoton.2013.48
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发表时间：
2013-05-01
期刊：
影响因子：
35
通讯作者：
Waks, Edo
中科院分区：
文献类型：
--
作者：
Kim, Hyochul;Bose, Ranojoy;Waks, Edo
集成的纳米光子器件创造了强大的光-物质相互作用，这对于固态量子网络(1)、分布式量子计算机(2)和超低功率光电子学（3,4）的发展至关重要。许多此类应用的关键组件是光子量子逻辑门，其中固态量子比特（量子比特）的量子状态有条件地控制光子量子比特的状态。这些门对于鲁棒量子网络（5-7）、非破坏性量子测量（8,9）和强光子-光子相互作用（10）的发展至关重要。在这里，我们通过实验实现了光光子和固态量子比特之间的量子逻辑门。量子比特由一个量子点与一个纳米腔强耦合组成，作为一个相干可控量子比特系统，在皮秒时间尺度上有条件地翻转光子的偏振，实现了一个可控非门。我们的研究结果代表了迈向固态量子网络的重要一步，并为在超快时间尺度上探测量子点光子相互作用提供了一种通用的方法。
Integrated nanophotonic devices create strong light-matter interactions that are important for the development of solid-state quantum networks(1), distributed quantum computers(2) and ultralow-power optoelectronics(3,4). A key component for many of these applications is the photonic quantum logic gate, where the quantum state of a solid-state quantum bit (qubit) conditionally controls the state of a photonic qubit. These gates are crucial for the development of robust quantum networks(5-7), non-destructive quantum measurements(8,9) and strong photon-photon interactions(10). Here, we experimentally realize a quantum logic gate between an optical photon and a solid-state qubit. The qubit is composed of a quantum dot strongly coupled to a nanocavity, which acts as a coherently controllable qubit system that conditionally flips the polarization of a photon on picosecond timescales, implementing a controlled-NOT gate. Our results represent an important step towards solid-state quantum networks and provide a versatile approach for probing quantum dot-photon interactions on ultrafast timescales.