Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E07: Solid-State QubitsLive
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Chair: Elizabeth Goldschmidt, UIUC |
Tuesday, June 1, 2021 2:00PM - 2:12PM Not Participating |
E07.00001: Rydberg gates in donors in silicon Eleanor Crane, Alexander Schuckert, Nguyen Le, Andrew J Fisher We predict a new variant of the Rydberg blockade gate which - considering the interaction to be the limiting parameter and not the Rabi frequency - we demonstrate theoretically to have an order of magnitude improvement in fidelities and speed over existing protocols. We do this using a Lindblad equation to model the noise characteristics of the Rydberg entangling gate proposed by Levine et al. Applying our new gate protocol to donors in silicon, we show that it would help overcome the strenuous requirements on atomic precision donor placement and substantial gate tuning, which so far has hampered scaling in this platform. We calculate multivalley Rydberg interactions for several donor species using the Finite Element Method, and show that induced electric dipole and Van der Waals interactions, calculated here for the first time, are important even for low-lying excited states. We show that Rydberg gate operation is possible within the lifetime of donor excited states with 99.9% fidelity for the creation of a Bell state in the presence of decoherence. |
Tuesday, June 1, 2021 2:12PM - 2:24PM Live |
E07.00002: Temperature dependence of phonon-limited spin relaxation rates of nitrogen-vacancy centers Matthew Cambria Understanding the limits to the electronic spin coherence of the nitrogen-vacancy (NV) center in diamond is vital to realizing the full potential of this quantum system. In prior work, we found that at room temperature the double-quantum relaxation rate is approximately twice the single-quantum relaxation rate, limiting the maximum theoretically achievable coherence time for an NV under ambient conditions to 6.8(2) ms. We presented theoretical arguments showing that the two-phonon Raman process which is believed to provide major contributions to the single-quantum relaxation rate at 295 K is forbidden from driving double-quantum relaxation [1]. Here we present experimental measurements of the phonon-limited double-quantum relaxation rate of the NV as a function of temperature. In addition, we discuss our theoretical efforts towards understanding the observed temperature dependence of the double-quantum relaxation rate, which may shed new light on spin-phonon coupling in the NV and may inform strategies to mitigate this relaxation. |
Tuesday, June 1, 2021 2:24PM - 2:36PM Live |
E07.00003: Optical Properties of Rubidium Atoms Trapped in Cryogenic Neon and Parahydrogen Solids David M Lancaster, Ugne Dargyte, Sunil Upadhyay, Jonathan D Weinstein The development of single-atom quantum sensors necessitates long coherence times and the ability to control and detect the states of single atoms. Previous work has shown that rubidium atoms trapped in solid parahydrogen have favorable spin coherence times, however optical fluorescence properties were untested. In this work, we investigate rubidium atoms that are trapped in cryogenic neon and parahydrogen solids. We find that Rb fluoresces efficiently when trapped in neon, while we find no evidence of it fluorescing in parahydrogen. We also find that Rb atoms trapped in neon can be optically cycled billions of times with little evidence of bleaching. Other key optical properties of both systems are discussed. |
Tuesday, June 1, 2021 2:36PM - 2:48PM Live |
E07.00004: Probing many-body noise in a strongly interacting two-dimensional spin ensemble ---- Part II: Theory Emily J Davis, Bingtian Ye, Francisco Machado, Simon Meynell, Thomas Mittiga, William K Schenken, Maxime Joos, Bryce H Kobrin, Yuanqi Lyu, Dolev Bluvstein, Soonwon Choi, Chong Zu, Ania C Jayich, Norman Y Yao Experimentally characterizing the full quantum dynamics of a many-body system requires performing state tomography, which becomes intractable as the system size increases. Nevertheless, studying the fluctuations of a small number of degrees of freedom may already provide important insights into the nature of the underlying dynamics; this notion is at the core of noise spectroscopy. In particular, measuring and controlling the quantum coherence of a probe spin coupled to the system provides a flexible framework for studying such fluctuations. In this talk, we present a framework whereby the decoherence dynamics of probe spins enables the direct extraction of important features of a many-body system. Motivated by recent experimental progress in disordered spin systems, we demonstrate how the details of the decoherence dynamics directly inform us of the system's dimensionality, spin density, and correlation time. Finally, we discuss the impact that the underlying microscopic dynamics --- and the resulting many-body noise --- have on the observed decoherence. |
Tuesday, June 1, 2021 2:48PM - 3:00PM Live |
E07.00005: Probing Electrical Dipolar Fluctuations via Impurity Qubit Relaxometry Rahul Sahay, Shubhayu Chatterjee, Satcher Hsieh, Norman Y Yao Characterizing the fluctuations of electrical dipoles in materials such as ferroelectrics is a problem relevant to advancing both fundamental physics and device applications. Indeed, such fluctuations, whether they arise in novel phases of matter or two-dimensional memory devices, are traditionally challenging to measure. We propose the use of depolarization dynamics of nearby quantum impurity qubits (e.g. NV centers in diamond) to directly sense these fluctuations with frequency and wave vector resolution. We demonstrate that such resolution can be used to probe the glassy dynamics of relaxor ferroelectrics, to extract critical exponents in para- to ferroelectric phase transitions, and to reconstruct the dispersion of dipolarons in neutral polar liquids. |
Tuesday, June 1, 2021 3:00PM - 3:12PM Live |
E07.00006: Probing nanoscale local thermalization in a 2D dipolar spin ensemble on the surface of diamond Kristine F Rezai, Soonwon Choi, Timo Graesser, Goetz S Uhrig, Mikhail Lukin, Alexander Sushkov We observe remarkably slow local spin dynamics in a two-dimensional disordered many-body dipolar spin system, formed by naturally-occurring electronic spins on the surface of a diamond crystal. Shallow NV centers are used to probe individual spins. We characterize the strength of dipolar interactions among the surface electronic spins and measure the on-site disorder. We observe slow spin transport at the level of single-spin correlation functions and can quantitatively explain our observations with a time-dependent disorder resonance counting theory. |
Tuesday, June 1, 2021 3:12PM - 3:24PM Live |
E07.00007: Investigation of charge dynamics of solid-state defects in diamond with single nitrogen-vacancy centers Aedan Robert H Gardill, Ishita Kemeny, Hossein Dinani, Ariel Norambuena, Matthew Cambria, Yanfei Li, Xiyu Xu, Jeronimo Maze, Shimon Kolkowitz The number of promising solid-state point defects for quantum technologies is expansive, and new applications for novel and underexplored defects are emerging in fields ranging from quantum information to nanoscale metrology. In order to fully utilize these defects, control over their charge states is required, but there remains much to learn about the charge dynamics of defects in wide-band-gap semiconductors. Here, we introduce a novel measurement scheme which allows us to investigate local charge dynamics in diamond using charge state readout on a single nitrogen-vacancy (NV) center. We present experimental results in which we use a single NV center defect to probe the charge dynamics of other NV centers, silicon-vacancy centers, and nitrogen defects deep in bulk diamond. We discuss the new insights this technique provides into charge dynamics and defect charge states within diamond. |
Tuesday, June 1, 2021 3:24PM - 3:36PM Live |
E07.00008: Characterization of CVD-grown NV-Diamond Material for Quantum Sensing Applications Connor A Hart, Matthew J Turner, Kevin S Olsson, Emma K Huckestein, Shantam Ravan, Mason C Marshall, Nithya Arunkumar, Ronald L Walsworth Ensembles of nitrogen-vacancy (NV) centres in diamond are a leading platform for practical quantum sensors. However, the reproducible and scalable fabrication of CVD-grown, NV-diamond material with favorable properties is critical to realizing envisioned applications. This talk will discuss recent advances in the development of NV-diamond material for magnetic sensing and imaging applications, including improved NV-ensemble charge state under optical illumination, increased conversion of Ns into NV, and reduced crystal lattice strain inhomogeneity. Characterization techniques utilizing the NV centers themselves as probes play a crucial role in these efforts. The ability to produce diamond with reproducible properties will also be described. |
Tuesday, June 1, 2021 3:36PM - 3:48PM Live |
E07.00009: Micron-scale AC quantum sensing using nitrogen-vacancy centers in diamond Nithya Arunkumar, Connor Hart, Dominik Bucher, Jner Tzern Oon, Kevin Olsson, Mark J Ku, Matthew Turner, David Glenn, Donhee Ham, Mikhail Lukin, Hongkun Park, Ronald L Walsworth Optically-probed nitrogen-vacancy (NV) quantum defects in a diamond, can optically detect AC magnetic signals with high-spectral resolution from micron-scale sample volumes. However, the performance of an ensemble NV sensor is limited by the magnetic field sensitivity of the device. We present a quantum memory readout technique for ensemble NVs that allows high-resolution micron-scale AC sensing with enhanced sensitivity. We also investigate the effect of the bias magnetic field and laser power on this measurement technique. |
Tuesday, June 1, 2021 3:48PM - 4:00PM On Demand |
E07.00010: Ensemble electron spin coherence of Rb atoms trapped in solid neon. Ugne Dargyte, David M Lancaster, Jonathan D Weinstein Rb atoms trapped in solid neon exhibit red-shifted laser-induced fluorescence and are highly resistant to optical bleaching. In this talk, we explore the additional properties needed for single-atom quantum sensing, focusing on the electron spin coherence lifetimes of Rb atoms implanted in solid Ne. We find that we can greatly enhance the ensemble electron spin coherence using dynamical decoupling techniques, making them highly sensitive ac magnetometers which are promising for applications in single-molecule NMR and nano-MRI. We also study the effects of sample growth conditions and the interactions of Rb atoms with the 21Ne spin bath on T2. |
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