Chirality of nanophotonic waveguide with embedded quantum emitter for unidirectional spin transfer.
Chirality of nanophotonic waveguide with embedded quantum emitter for unidirectional spin transfer.
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DOI：
10.1038/ncomms11183
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发表时间：
2016-03-31
影响因子：
16.6
通讯作者：
Makhonin MN
中科院分区：
文献类型：
--
作者：
Coles RJ;Price DM;Dixon JE;Royall B;Clarke E;Kok P;Skolnick MS;Fox AM;Makhonin MN
集成电路几何中物质量子比特与光子量子比特之间的忠实转换可以实现可扩展的量子技术。在这种情况下，量子点具有定义良好的自旋态（物质量子比特），可以有效地与光子耦合。通过将它们嵌入到纳米光子波导中，它们为量子技术的实现提供了一个有前途的平台。在本文中，我们证明了在纳米束波导中产生的自然发生的电磁场手性导致量子点自旋态的单向光子发射，并导致物质-量子比特信息的平面内传递。尽管波导具有非手性几何形状和材料，但仍存在手性行为。利用点配准技术，我们实现了量子发射极确定定位于手性点，并通过设计实现了自旋路径转换。我们进一步表明，与标准光子晶体波导相比，这种手性现象对点位置的容错性要大得多，自旋路径读数高达95±5%，并有可能作为自旋逻辑和网络实现的基础。可扩展量子技术需要存储在固态系统中的量子比特与飞行的光子量子比特之间的有效转换。在这里，作者证明了光子波导的电磁场手性导致了嵌入式量子点发射器的单向发射。
Scalable quantum technologies may be achieved by faithful conversion between matter qubits and photonic qubits in integrated circuit geometries. Within this context, quantum dots possess well-defined spin states (matter qubits), which couple efficiently to photons. By embedding them in nanophotonic waveguides, they provide a promising platform for quantum technology implementations. In this paper, we demonstrate that the naturally occurring electromagnetic field chirality that arises in nanobeam waveguides leads to unidirectional photon emission from quantum dot spin states, with resultant in-plane transfer of matter-qubit information. The chiral behaviour occurs despite the non-chiral geometry and material of the waveguides. Using dot registration techniques, we achieve a quantum emitter deterministically positioned at a chiral point and realize spin-path conversion by design. We further show that the chiral phenomena are much more tolerant to dot position than in standard photonic crystal waveguides, exhibit spin-path readout up to 95±5% and have potential to serve as the basis of spin-logic and network implementations. Scalable quantum technologies require efficient conversion between qubits stored in solid-state systems and flying photonic qubits. Here, the authors demonstrate that the electromagnetic field chirality of a photonic waveguide leads to unidirectional emission from an embedded quantum dot emitter.