Abstract
We report the creation of a low-loss, broadband optical antenna giving highly directed output from a coherent single spin in the solid-state. The device, the first solid-state realization of a dielectric antenna, is engineered for individual nitrogen vacancy (NV) electronic spins in diamond. We demonstrate a directionality close to 10. The photonic structure preserves the high spin coherence of single crystal diamond (T2>100us). The single photon count rate approaches a MHz facilitating efficient spin readout. We thus demonstrate a key enabling technology for quantum applications such as high-sensitivity magnetometry and long-distance spin entanglement.
Highlights
The electronic spin associated with the nitrogen-vacancy (NV) center in diamond constitutes a versatile quantum system with applications in nanoscale magnetometry [1,2,3], quantum communication [4,5,6], and quantum information processing [7]
Total internal reflection can be reduced by employing solid immersion lenses (SILs) [11,12] or diamond nanocrystals [13]
We demonstrate successful antenna operation and the addressing of single-NV spins in the antenna
Summary
The electronic spin associated with the nitrogen-vacancy (NV) center in diamond constitutes a versatile quantum system with applications in nanoscale magnetometry [1,2,3], quantum communication [4,5,6], and quantum information processing [7]. Increased NV PL detection rates lead to improved sensitivities in magnetometry applications [10] and higher two-photon interference rates for entangling remote NV spins [7] These collection efficiencies, are intrinsically limited by the nondirectional emission of NV PL and total internal reflection between the high-index diamond host material and its low-index surrounding. A new alternative approach based on a layered dielectric optical antenna was proposed and demonstrated for individual molecules in a low-index polymer matrix [19] Such a “dielectric optical antenna” stands out due to its broadband and almost lossless operation, which can, in principle, yield near-unity collection efficiencies for single emitters [20,21]. The concept is general and versatile: it is potentially powerful for other broadband solid-state emitters
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