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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Demonstration of the quantum Zeno effect on the nitrogen vacancy center in nanodiamond

Janik Wolters, Max Strauß, Rolf Simon Schoenfeld, Oliver J. Benson

Published May 1, 2013• 0 citations

Abstract

Already in 430 BC ancient Greek's philosopher Zeno of Elea formulated his well known paradox: An object that can be observed at any instant of time at a well defined position can not move. Today, this paradox is solved by the infinitesimal calculus invented by Newton and Leibniz in the 18 century. Nevertheless in 1977 it was shown that Zeno's paradox rises again from the formalism of quantum mechanics [1]. We present our latest measurement results on the quantum Zeno effect in a solid state spin, namely the ground state spin of a single negatively charged nitrogen vacancy (NV) center in diamond [2]. These results are supported by an extended theoretical analysis and give evidence that the quantum Zeno effect is physical reality not only in atomic systems [3], but also in nanoscopic solid state systems [4].

DOI: 10.1109/cleoe-iqec.2013.6801617

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Already in 430 BC ancient Greek's philosopher Zeno of Elea formulated his well known paradox: An object that can be observed at any instant of time at a well defined position can not move. Today, this paradox is solved by the infinitesimal calculus invented by Newton and Leibniz in the 18 century. Nevertheless in 1977 it was shown that Zeno's paradox rises again from the formalism of quantum mechanics [1]. We present our latest measurement results on the quantum Zeno effect in a solid state spin, namely the ground state spin of a single negatively charged nitrogen vacancy (NV) center in diamond [2]. These results are supported by an extended theoretical analysis and give evidence that the quantum Zeno effect is physical reality not only in atomic systems [3], but also in nanoscopic solid state systems [4].

The nitrogen vacancy (NV) defect center in diamond is one of the most promising candidates for future solid state quantum technologies. Starting with recent experiments on the demonstration of fundamental quantum effects, like the quantum Zeno effect on a single NV center, theoretical studies on the implementation of a fundamental cavity assisted two-qubit quantum gate are presented. These studies outline a route towards deterministic quantum information processing on a realistic solid state platform, considering in particular radiative dephasing and spectral diffusion.

Defect centers in diamond are regarded as a promising candidate for future solid state quantum technology. In particular the nitrogen vacancy (NV) center attracts researchers attention, as it promises to emit indistinguishable single photons and provides a triplet ground state with ultra long spin coherence times. In particular NV centers in nano diamonds are attractive, since they can be integrated into quantum photonic hybrid devices with nano manipulation techniques. We report on first demonstrations of the integration of NV-centers into photonic hybrid devices, and point out future applications. Beside the striking demonstrations of the integrability, nanodiamonds have several drawbacks. In particular the spectral diffusion of the zero-phonon line is addressed.

Abstract Powered by the mutual developments in instrumentation, materials and theoretical descriptions, sensing and imaging capabilities of quantum emitters in solids have significantly increased in the past two decades. Quantum emitters in solids, whose properties resemble those of atoms and ions, provide alternative ways to probing natural and artificial nanoscopic systems with minimum disturbance and ultimate spatial resolution. Among those emerging quantum emitters, the nitrogen vacancy (NV) color center in diamond is an outstanding example due to its intrinsic properties at room temperature (highly-luminescent, photo-stable, biocompatible, highly-coherent spin states). This review article summarizes recent advances and achievements in using NV centers within nano- and single crystal diamonds in sensing and imaging. We also highlight prevalent challenges and material aspects for different types of diamond and outline the main parameters to consider when using color centers as sensors. As a novel sensing resource, we highlight the properties of NV centers as light emitting electrical dipoles and their coupling to other nanoscale dipoles e.g. graphene.