Browsing by Author "Kaiser, Florian"

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    Addressing single nuclear spins quantum memories by a central electron spin
    (2022) Vorobyov, Vadim; Javadzade, Javid; Joliffe, Matthew; Kaiser, Florian; Wrachtrup, Jörg
    Nuclei surrounding single electron spins are valuable resources for quantum technology. For application in this area, one is often interested in weakly coupled nuclei with coupling strength on the order of a few 10-100 kHz. In this paper, we compare methods to address single nuclear spins with this type of hyperfine coupling to a single electron spin. To achieve the required spectral resolution, we specifically focus on two methods, namely dynamical decoupling and correlation spectroscopy. We demonstrate spectroscopy of two single nuclear spins and present a method to derive components of their hyperfine coupling tensor from those measurements.
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    The silicon vacancy centers in SiC : determination of intrinsic spin dynamics for integrated quantum photonics
    (2024) Liu, Di; Kaiser, Florian; Bushmakin, Vladislav; Hesselmeier, Erik; Steidl, Timo; Ohshima, Takeshi; Son, Nguyen Tien; Ul-Hassan, Jawad; Soykal, Öney O.; Wrachtrup, Jörg
    The negatively charged silicon vacancy center ( VSi-) in silicon carbide (SiC) is an emerging color center for quantum technology covering quantum sensing, communication, and computing. Yet, limited information currently available on the internal spin-optical dynamics of these color centers prevents us from achieving the optimal operation conditions and reaching the maximum performance especially when integrated within quantum photonics. Here, we establish all the relevant intrinsic spin dynamics of the VSi-center at cubic lattice site (V2) in 4H-SiC by an in-depth electronic fine structure modeling including the intersystem-crossing and deshelving mechanisms. With carefully designed spin-dependent measurements, we obtain all the previously unknown spin-selective radiative and non-radiative decay rates. To showcase the relevance of our work for integrated quantum photonics, we use the obtained rates to propose a realistic implementation of time-bin entangled multi-photon GHZ and cluster state generation. We find that up to three-photon GHZ or cluster states are readily within reach using the existing nanophotonic cavity technology.