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DTSTART:20261101T010000
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DESCRIPTION:Long-Lived Mechanically Detected Molecular Spins for Quantum SensingSahand TabatabaeiLocation: QNC 1201\nAbstractQuantum sensors based on individual spins provide access to local magnetic fields in condensed matter\, chemistry\, and biology\, with solid-state defect spins emerging as a leading platform. Their application to molecular sensing\, however\, is constrained by confinement to a host lattice\, which limits how closely the sensor can be positioned relative to a target molecule. Molecular spins offer an alternative\, providing chemical tunability and flexible positioning relative to the system of interest.In this talk\, I will present SQUINT (Spin-based QUantum Integrated Nanomechanical Transduction)\, a nanoscale sensing platform combining molecular electron spins\, ultrasensitive mechanical readout\, and Hamiltonian engineering. Using a modified XYXY dipolar-decoupling sequence\, we suppress electron-electron dipolar interactions across a broad distribution of control fields and extend coherence times to approximately 400 μs in an attoliter-scale sample containing approximately 100 trityl-OX063 radicals. We then use these long-lived spins for frequency-selective detection of nanotesla-scale AC magnetic fields and for sensing and spectroscopy of small\, local nuclear-spin ensembles. These results establish SQUINT as a framework for quantum sensing that provides molecular-level control over sensor properties and allows direct integration with complex molecular targets.
X-ALT-DESC;FMTTYPE=text/html:Long-Lived Mechanically Detected Molecular Spins for Quantum SensingSahand TabatabaeiLocation: QNC 1201<br />AbstractQuantum sensors based on individual spins provide access to local magnetic fields in condensed matter, chemistry, and biology, with solid-state defect spins emerging as a leading platform. Their application to molecular sensing, however, is constrained by confinement to a host lattice, which limits how closely the sensor can be positioned relative to a target molecule. Molecular spins offer an alternative, providing chemical tunability and flexible positioning relative to the system of interest.In this talk, I will present SQUINT (Spin-based QUantum Integrated Nanomechanical Transduction), a nanoscale sensing platform combining molecular electron spins, ultrasensitive mechanical readout, and Hamiltonian engineering. Using a modified XYXY dipolar-decoupling sequence, we suppress electron-electron dipolar interactions across a broad distribution of control fields and extend coherence times to approximately 400 μs in an attoliter-scale sample containing approximately 100 trityl-OX063 radicals. We then use these long-lived spins for frequency-selective detection of nanotesla-scale AC magnetic fields and for sensing and spectroscopy of small, local nuclear-spin ensembles. These results establish SQUINT as a framework for quantum sensing that provides molecular-level control over sensor properties and allows direct integration with complex molecular targets.
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SUMMARY:IQC PhD seminar featuring Sahand Tabatabaei
DTSTART;TZID=America/New_York:20261001T140000
DTEND;TZID=America/New_York:20261001T150000
DTSTAMP:20260920T183539Z
TRANSP:OPAQUE
STATUS:CONFIRMED
SEQUENCE:0
LOCATION:QNC 1201
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