title: Hybrid sensors based on colour centres in diamond and piezoactive layers.
abstract: The ability to measure weak signals such as pressure, force, electric field and temperature with nanoscale devices and high spatial resolution offers a wide range of applications in fundamental and applied sciences. Here we present a proposal for a hybrid device composed of thin film layers of diamond with colour centres and piezoactive elements for the transduction and measurement of physical signals. The magnetic response of a piezomagnetic layer to an external stress or a stress induced by a signal is shown to affect significantly the spin properties of nitrogen-vacancy centres in diamond. Under ambient conditions, realistic environmental noise and material imperfections, we show that this hybrid device can achieve significant improvements in sensitivity over the pure diamond-based approach in combination with nanometre-scale spatial resolution. Furthermore, the proposed hybrid architecture offers novel possibilities for engineering strong coherent couplings between nanomechanical oscillator and solid state spin qubits.
authors.affiliation: 1] Institut für Theoretische Physik, Universität Ulm, Albert-Einstein Allee 11, 89069 Ulm, Germany [2] Centre for Integrated Quantum Science and Technology, Universität Ulm, 89069 Ulm, Germany.
authors.forename: Jianming
authors.initials: J
authors.lastname: Cai
authors.affiliation: 1] Centre for Integrated Quantum Science and Technology, Universität Ulm, 89069 Ulm, Germany [2] Institut für Quantenoptik, Universität Ulm, Albert-Einstein Allee 11, 89069 Ulm, Germany.
authors.forename: Fedor
authors.initials: F
authors.lastname: Jelezko
authors.affiliation: 1] Institut für Theoretische Physik, Universität Ulm, Albert-Einstein Allee 11, 89069 Ulm, Germany [2] Centre for Integrated Quantum Science and Technology, Universität Ulm, 89069 Ulm, Germany.
authors.forename: Martin B
authors.initials: MB
authors.lastname: Plenio