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We report experimental realization of a quantum version of Maxwell's demon using solid state spins where the information acquiring and feedback operations by the demon are achieved through conditional quantum gates.A unique feature of this implementation is that the demon can start in a quantum superposition state or in an entangled state with an ancilla observer. Through quantum state tomography, we measure the entropy in the system, demon, and the ancilla, showing the influence of coherence and entanglement on the result. A quantum implementation of Maxwell's demon adds more controllability to this paradoxical thermal machine and may find applications in quantum thermodynamics involving microscopic systems. 相似文献
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正A:Experimental Setup We use a home-built confocal microscopy with an oil immersed objective lens to address and detect single nitrogen vacancy(NV)centers in a single-crystal diamond sample,which is mounted on a doughnut shape,three-axis,closed-loop piezoelectric actuator 相似文献
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光学平面面形的绝对检验技术规避了干涉仪参考面形精度的制约,能够有效提高平晶面形的检测精度。采用N次图像旋转法的两平晶三面互检的绝对检验技术,求解待测平晶的三维绝对面形分布,结果中包含了中频波段的信息。利用递推公式构造旋转变化项的N次虚拟旋转结果,求和平均后得到旋转变化项,叠加旋转不变项结果后得到待测波面面形。推导了算法的理论误差,针对旋转角度进行优化并增加虚拟旋转次数,提高了算法精度,优化后的仿真结果的残差波面的均方根值精度为0.14 nm。对150 mm口径平晶进行两平晶三面互检实验,并将实验结果与传统三面互检法结果进行比对,均方根值偏差小于0.5 nm,验证了算法的准确性。 相似文献
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本文借助外延生长及离子掺杂技术,基于NaYbF4:2%Er3+微米晶体构建了多种不同的核壳微米盘,通过降低材料的表面猝灭效应及增强离子间的能量传递效应,实现了NaYbF4:2%Er3+微米晶体上转换红光发射的增强.研究结果表明:在980 nm近红外激光激发下,构建的NaYbF4:2%Er3+@NaYbF4@NaYF4核-壳-壳微米盘的上转换红光发射强度相比于NaYbF4:2%Er3+微米盘增强了4.6倍,红绿比由6.3提高至8.1.当少量Ho3+离子引入到NaYbF4:2%Er3+@NaYbF4:2%Ho3+@NaYF4核-壳-壳微米盘时, Er3+离子与Ho3+离子间相互作用的发生使其上转换红光... 相似文献
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