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We investigate the enhanced electric dipole–dipole interaction of surface plasmon polaritons (SPPs) supported by a planar metal film waveguide. By taking two nitrogen-vacancy (NV) center electric dipoles in diamond as an example, both the coupling strength and collective relaxation of two dipoles are studied with the numerical Green Function method. Compared to two-dipole coupling on a planar surface, metal film provides stronger and tunable coupling coefficients. Enhancement of the interaction between coupled NV center dipoles could have applications in both quantum information and energy transfer investigation. Our investigation provides systematic results for experimental applications based on a dipole–dipole interaction mediated with SPPs on a planar metal film. [ABSTRACT FROM AUTHOR]

Single-photon flux is one of the crucial properties of nitrogen vacancy (NV) centers in diamond for its application in quantum information techniques. Here we fabricate diamond conical nanowires to enhance the single-photon count rate. Through the interaction between tightly confined optical mode in nanowires and NV centers, the single-photon lifetime is much shortened and the collection efficiency is enhanced. As a result, the detected single-photon rate can be at 564 kcps, and the total detection coefficient can be 0.8%, which is much higher than that in bulk diamond. Such a nanowire single-photon device with high photon flux can be applied to improve the fidelity of quantum computation and the precision of quantum sensors. [ABSTRACT FROM AUTHOR]

The coupled negatively charged nitrogen-vacancy (NV−) center system is a promising candidate for scalable quantum information techniques. In this work, ionized nitrogen molecules are implanted into bulk diamond to generate coupled NV− center pairs. The two-photon autocorrelation measurement and optically detected magnetic resonance measurement are carried out to confirm the production of the NV− center pair. Also, both 1.3 μs decoherence time and 4.9 kHz magnetic coupling strength of the NV− center pair are measured by controlling and detecting the spin states. Along with nanoscale manipulation and detection methods, such coupled NV− centers through short distance dipole-dipole interaction would show high potential in scalable quantum information processes. [ABSTRACT FROM AUTHOR]