title: Single spin optically detected magnetic resonance with 60-90 GHz (E-band) microwave resonators.
abstract: Magnetic resonance with ensembles of electron spins is commonly performed around 10 GHz, but also at frequencies above 240 GHz and in corresponding magnetic fields of over 9 T. However, experiments with single electron and nuclear spins so far only reach into frequency ranges of several 10 GHz, where existing coplanar waveguide structures for microwave (MW) delivery are compatible with single spin readout techniques (e.g., electrical or optical readout). Here, we explore the frequency range up to 90 GHz, with magnetic fields of up to ≈3 T for single spin magnetic resonance in conjunction with optical spin readout. To this end, we develop MW resonators with optical single spin access. In our case, rectangular 60-90 GHz (E-band) waveguides guarantee low-loss supply of microwaves to the resonators. Three dimensional cavities, as well as coplanar waveguide resonators, enhance MW fields by spatial and spectral confinement with a MW efficiency of 1.36 mT/√W. We utilize single nitrogen vacancy (NV) centers as hosts for optically accessible spins and show that their properties regarding optical spin readout known from smaller fields (<0.65 T) are retained up to fields of 3 T. In addition, we demonstrate coherent control of single nuclear spins under these conditions. Furthermore, our results extend the applicable magnetic field range of a single spin magnetic field sensor. Regarding spin based quantum registers, high fields lead to a purer product basis of electron and nuclear spins, which promises improved spin lifetimes. For example, during continuous single-shot readout, the (14)N nuclear spin shows second-long longitudinal relaxation times.
authors.affiliation: 3. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors.forename: Nabeel
authors.initials: N
authors.lastname: Aslam
authors.affiliation: 3. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Pfender
authors.affiliation: 3. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors.forename: Rainer
authors.initials: R
authors.lastname: Stöhr
authors.affiliation: 3. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Neumann
authors.affiliation: 1. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors.forename: Marc
authors.initials: M
authors.lastname: Scheffler
authors.affiliation: Sumitomo Electric Industries, Ltd., Itami 664-001, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Sumiya
authors.affiliation: Japan Atomic Energy Agency, Takasaki 370-1292, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Abe
authors.affiliation: Japan Atomic Energy Agency, Takasaki 370-1292, Japan.
authors.forename: Shinobu
authors.initials: S
authors.lastname: Onoda
authors.affiliation: Japan Atomic Energy Agency, Takasaki 370-1292, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ohshima
authors.affiliation: Research Center for Knowledge Communities, University of Tsukuba, Tsukuba 305-8550, Japan.
authors.forename: Junichi
authors.initials: J
authors.lastname: Isoya
authors.affiliation: 3. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Wrachtrup