Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session L18: Advances in Quantum SensingInvited Undergrad Friendly
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Sponsoring Units: DCMP Chair: Lee Bassett, University of Pennsylvania Room: 205 |
Wednesday, March 4, 2020 8:00AM - 8:36AM |
L18.00001: New experimental approaches for exploring condensed matter physics Invited Speaker: Amir Yacoby The magnetic fields generated by spins and currents provide a unique window into the physics of |
Wednesday, March 4, 2020 8:36AM - 9:12AM |
L18.00002: Photonic quantum states for quantum applications Invited Speaker: Virginia O Lorenz Quantum applications often require the carriers of information, or qubits, to have specific properties. Photonic quantum states are good carriers of information because they are robust to environmental fluctuations, but generating photons with just the right properties is still a challenge. I will present our work on generating, engineering and characterizing photonic quantum states for quantum applications. This work is funded in part by NSF Grant Nos. 1640968, 1806572, 1839177, and 1936321. |
Wednesday, March 4, 2020 9:12AM - 9:48AM |
L18.00003: Hybrid sensing approaches for quantum spin sensors Invited Speaker: Michael Flatté Quantum sensing, for example using diamond NV spin centers, has been effectively demonstrated for magnetic and electric fields as well as to measure the local temperature. Novel methods using hybrid sensing modalities, in which auxiliary entities are exploited to interact with the quantum sensor, are now under intense investigation. These include using a nearby ferromagnetic particle with a freely orientable magnetization, which amplifies the magnetic field of a sensed object to the point where it can be detected by a quantum spin sensor. Here I will describe two recent proposals for hybrid sensing modalities. In the first proposal the magnetic field of the NV spin itself is used to generate a magnetic response from a nearby material, and the resulting magnetic field is detected by the spin center. This extends quantum sensing to diamagnetic materials, for which the magnetic susceptibility is the desired metric. In the second proposal single-photon detection by a photoreceptive molecule, which changes its conformation in response to the absorption of a photon, can be measured using quantum sensing of the resulting electric dipole change due to the new shape of the molecule. These results suggest many new hybrid modalities are possible based on current quantum spin sensors. This work done in collaboration with J. van Bree and N. J. Harmon. |
Wednesday, March 4, 2020 9:48AM - 10:24AM |
L18.00004: Defect spins in two-dimensional materials for quantum sensing and nanophotonics Invited Speaker: Lee Bassett Optically addressable spin defects like the diamond nitrogen-vacancy center enable versatile applications in precision sensing and nanoscale imaging. Related defects in other materials, especially two-dimensional materials such as hexagonal boron nitride (hBN), offer potential advantages and novel sensing capabilities. Van der Waals materials like hBN can host defects in a precise two-dimensional layer, at a surface that is potentially cleaner than that three-dimensional semiconductors. This talk will introduce the properties of optically active defects in hBN, focusing in particular on their room-temperature optical and spin properties [1,2]. We will also discuss the role of new materials and defects more broadly for use in quantum sensing and other applications in quantum science [3]. |
Wednesday, March 4, 2020 10:24AM - 11:00AM |
L18.00005: What would you do with a quantum-limited torque magnetometer? Invited Speaker: John Davis In the past decade, cavity optomechanics has demonstrated its awesome potential to bring quantum mechanics into the study of mechanical systems. Yet little work has been done to use cavity optomechanics for sensing applications, such as the study of condensed matter systems. At the University of Alberta, we have focused on harnessing cavity optomechanical detection to measure ever smaller moment of inertia resonators, thereby improving torque sensing. Combining this with low temperature operation, we have reached torque sensitivities on the order of 10-24 N●m/√Hz, just ten times the device’s standard quantum limit. To date, we have used such cavity optomechanical torque sensors to explore nanomagnetic vortices, collective spin dynamics, and phase-shift keying applications, but potential quantum sensing applications are numerous. Looking forward, it will also be possible to use the toolbox of quantum optics such as single photon detectors and squeezed states, along with cavity optomechanics, to enable new frontiers of quantum sensing and to push beyond the standard quantum limit. |
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