Research Highlights from 2016-2019

Title, Journal: Ultrasensitive Magnetometer using a Single Atom, Physical Review Letters, What?: Using a single atomic ion as a sensor, the authors experimentally attain a sensitivity close to the standard quantum limit, even at high frequency fields, by adapting a dynamical decoupling scheme that allows for extending T2 by orders of magnitude and merging it with a magnetic sensing protocol. Who?: IQST Fellow M.B. Plenio Read more
Title, Journal: Quantum Metrology Enhanced by Repetitive Quantum Error Correction, Physical Review Letters, What?: A long-lived nuclear spin is used to correct multiple phase errors on a sensitive electron spin in diamond and realize magnetic field sensing beyond the time scales set by natural decoherence, Who?: IQST YR B. Naydenov, IQST Fellows M.B. Plenio, F. Jelezko  Read more
Title, Journal: Crossover from Classical to Quantum Kibble-Zurek Scaling, Physical Review Letter, What?: The Kibble-Zurek hypothesis predicts the scaling of the defect formation immediately after quenches across classical and quantum phase transitions as a function of the quench speed. In this work the value of the quench rate that separates the classical and quantum regimes is estimated. Who?: IQST Fellow T. Calarco, S. Montangero Read more
Title, Journal: Jahn-Teller Effect in Systems with Strong On-Site Spin-Orbit Coupling, Physical Review Letters What?: When strong spin-orbit coupling removes orbital degeneracy, it would at the same time appear to render the Jahn-Teller mechanism ineffective; such a situation is discussed, Who?: IQST Fellow M. Daghofer  Read more
Title, Journal: Real-Time Dynamics in U(1) Lattice Gauge Theories with Tensor Networks, Physical Review X, What?: This work exploits recent algorithmic developments in the field of gauge-invariant tensor networks to investigate the real-time dynamics of string breaking in a quantum link formulation of the one-dimensional U(1) lattice gauge theory. Who?: IQST Fellow S. Montangero Read more
Title, Journal: A Four-Coordinate Cobalt(II) Single Ion Magnet With Coercivity and a Very High Energy Barrier, Nature Communications. What?: A cobalt single molecule magnet, with a record breaking energy barrier towards relaxation of the magnetization, was discovered and the origin of its properties fully elucidated. Who?: IQST Fellow J. van Slageren  Read more
Title, Journal: Nuclear magnetic resonance detection and spectroscopy of single proteins using quantum logic, Science, What?: Quantum logic, to improve readout fidelity, and a surface treatment technique, to extend the spin coherence time of shallow NV centers, are used to demonstrate a sensitivity sufficient to perform magnetic spectroscopy of an individual protein, Who?: IQST PI L. McGuinness IQST Fellows F. Jelezko Read more
Title, Journal: Observing the Rosensweig instability of a quantum ferrofluid, Nature, What?: A quantum fluid of tiny magnets, dysprosium atoms, was created with the properties of gases, crystals and superfluids combined into a single unique state of matter.  Who?: IQST PI: I. Ferrier-Barbut, IQST Fellow T. Pfau Read more