Macroscopic non-classical states and terahertz quantum processing in room-temperature diamond
Macroscopic non-classical states and terahertz quantum processing in room-temperature diamond
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DOI：
10.1038/nphoton.2011.296
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发表时间：
2012-01-01
期刊：
影响因子：
35
通讯作者：
Walmsley, I. A.
中科院分区：
文献类型：
--
作者：
Lee, K. C.;Sussman, B. J.;Walmsley, I. A.
人们对熟悉的经典宏观世界和量子微观世界之间的转变的本质仍然知之甚少。因此，将可观测量子行为的范围扩展到大型物体是一个令人兴奋的开放问题(1)。在相互作用的粒子的宏观系统中，快速加热通常会在室温下测量或使用之前破坏任何量子相干性[2]。在这里，我们演示了在环境条件下宏观钻石样品的振动模式的量子过程。利用超快拉曼散射，我们在块状金刚石的光学声子模中产生了一个扩展的、高度非经典的态。声子相干和关联的直接测量建立了晶体动力学的非经典性质。这些结果表明，钻石中的光学声子为研究大规模量子行为提供了一个独特的机会，并突出了钻石作为能够以太赫兹速率工作的微型光子量子处理器的潜力。
The nature of the transition between the familiar classical, macroscopic world and the quantum, microscopic one continues to be poorly understood. Expanding the regime of observable quantum behaviour to large-scale objects is therefore an exciting open problem(1). In macroscopic systems of interacting particles, rapid thermalization usually destroys any quantum coherence before it can be measured or used at room temperature(2). Here, we demonstrate quantum processing in the vibrational modes of a macroscopic diamond sample under ambient conditions. Using ultrafast Raman scattering, we create an extended, highly non-classical state in the optical phonon modes of bulk diamond. Direct measurement of phonon coherence and correlations establishes the non-classical nature of the crystal dynamics. These results show that optical phonons in diamond provide a unique opportunity for the study of large-scale quantum behaviour, and highlight the potential for diamond as a micro-photonic quantum processor capable of operating at terahertz rates.