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    Vanadyl spin qubit 2D arrays and their integration on superconducting resonators

    Year: 2020

    Journal: Mater. Horizons, Volume 7, MAR 1, page 885–897

    Authors: Urtizberea, Ainhoa; Natividad, Eva; Alonso, Pablo J.; Perez-Martinez, Laura; Andres, Miguel A.; Gascon, Ignacio; Gimeno, Ignacio; Luis, Fernando; Roubeau, Olivier

    Organizations: Spanish MINECO [MAT2017-86826-R, MAT2016-78257-R, CTQ2015-64486-R, PCI2018-093116, RTI2018-096075-B-C21]; Aragon government (DGA)Gobierno de Aragon [PLATON E31_17R, QMAD E09_17R]; EU quantERA through project SUMO; Spanish Ministerio de EducacionSpanish Government [FPU14/05367]

    Vanadyl systems have been shown to possess superior quantum coherence among molecular spin qubits. Meanwhile two-dimensional (2D) networks of spin qubit nodes could provide a means to achieve the control of qubit localization and orientation required for implementation of molecular spin qubits in hybrid solid-state devices. Here, the 2D metal-organic framework [{VO(TCPP)}Zn-2(H2O)(2)](infinity) is reported and its vanadyl porphyrin node is shown to exhibit superior spin dynamics and to enable coherent spin manipulations, making it a valid spin qubit candidate. Nanodomains of the MOF 2D coordination planes are efficiently formed at the air-water interface, first under Langmuir-Schaefer conditions, allowing mono- and multiple layer deposits to be transferred to a variety of substrates. Similar nanodomains are then successfully formed in situ on the surface of Nb superconducting coplanar resonators. Transmission measurements with a resonator with a 14 mu m-wide constriction allow to estimate that the single spin-photon coupling G(1) of the vanadyl spins in the nanodomains is close to being optimal, at ca. 0.5 Hz. Altogether, these results provide the basis for developing a viable hybrid quantum computing architecture.
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