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arXiv 2108.06248quant-phcond-mat.mes-hallphysics.optics
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声子波导中的非经典力学态

Non-classical mechanical states guided in a phononic waveguide

Amirparsa Zivari, Robert Stockill, Niccolò Fiaschi, Simon Gröblacher

摘要:

创造、操纵和探测光的非经典态的能力是量子物理学和量子技术发展的关键。实现对声子(振动量子)相同水平的控制可能会产生类似的影响,特别是在量子传感和量子信息处理领域。在这里,我们提出了一个至关重要的一步,实现这种水平的控制和单个声子在悬浮硅微结构的单模波导。我们使用腔波导架构,其中腔被用作源和检测器的机械激发,而波导有一个独立的结束,以反映声子。这使我们能够观察到声子在源和反射器之间的多次往返。几乎100个$μs$的长机械寿命证明了单个声子在原则上数十厘米内几乎无损传输的可能性。我们的实验证明了对强烈限制在传播轴横向方向上的单个声子的完全片上控制,这可能使电信波长的时间编码多模量子存储器和先进的量子声学实验成为可能。

英文摘要:

The ability to create, manipulate and detect non-classical states of light has been key for many recent achievements in quantum physics and for developing quantum technologies. Achieving the same level of control over phonons, the quanta of vibrations, could have a similar impact, in particular on the fields of quantum sensing and quantum information processing. Here we present a crucial step towards this level of control and realize a single-mode waveguide for individual phonons in a suspended silicon micro-structure. We use a cavity-waveguide architecture, where the cavity is used as a source and detector for the mechanical excitations, while the waveguide has a free standing end in order to reflect the phonons. This enables us to observe multiple round-trips of the phonons between the source and the reflector. The long mechanical lifetime of almost 100 $μs$ demonstrates the possibility of nearly lossless transmission of single phonons over, in principle, tens of centimeters. Our experiment demonstrates full on-chip control over traveling single phonons strongly confined in the directions transverse to the propagation axis, potentially enabling a time-encoded multimode quantum memory at telecom wavelength and advanced quantum acoustics experiments.

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