Collective State Measurement of Mesoscopic Ensembles with Single-Atom Resolution by Zhang, Hao, McConnell, Robert P., Cuk, Senka, Schleier-Smith, Monika H., Leroux, Ian Daniel, Vuletic, Vladan, Lin, Qian, Ph. D. Massachusetts Institute of Technology

“…While spatially varying coupling of atoms to the cavity prevents the direct observation of a quantized signal, the demonstrated measurement resolution provides the readout capability necessary for atomic interferometry substantially below the standard quantum limit and down to the Heisenberg limit.…”
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Generating entangled spin states for quantum metrology by single-photon detection by Zhang, Hao, Schleier-Smith, Monika, McConnell, Robert P., Cuk, Senka, Vuletic, Vladan, Hu, Jiazhong, Ph. D. Massachusetts Institute of Technology

“…The entanglement generation can be made quasideterministic by means of repeated trial and feedback, enabling metrology beyond the standard quantum limit.…”
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Transport signatures of Fermi surface topology change in BiTeI by Ye, Linda, Kagawa, Fumitaka, Tokura, Yoshinori, Checkelsky, Joseph George

“…We report a quantum magnetotransport signature of a change in the Fermi surface topology in the Rashba semiconductor BiTeI with a systematic tuning of the Fermi level E[subscript F]. Beyond the quantum limit, we observe a marked increase (decrease) in electrical resistivity when E[subscript F] is above (below) the Dirac node that we show originates from the Fermi surface topology. …”
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Quantum photonic sensors array with machine learning for imaging applications by Liu, Shuyi

“…In this paper, we propose an entangled photonic quantum sensor network with a radio frequency spectral range with the sensitivity and accuracy of sensors even beyond the standard quantum limit (SQL). Based on this model, we derived the variance model of the sensor array and analyzed the optimize parameter settings the sensor array and verified it by simulation. …”
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Excess-noise cancellation for quadrature-squeezed light through scattering media via two-sided wavefront shaping by Dong Li, Pidong Wang, Feng Huang, Mingle Liao, Wenjie Wang, Yao Yao

“…The exact condition for the reduced noise to reach below the standard quantum limit is given. Intriguingly, the excess noise can be fully erased in certain case. …”
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High-mobility two-dimensional carriers from surface Fermi arcs in magnetic Weyl semimetal films by Shingo Kaneta-Takada, Yuki K. Wakabayashi, Yoshiharu Krockenberger, Toshihiro Nomura, Yoshimitsu Kohama, Sergey A. Nikolaev, Hena Das, Hiroshi Irie, Kosuke Takiguchi, Shinobu Ohya, Masaaki Tanaka, Yoshitaka Taniyasu, Hideki Yamamoto

“…In addition, at low temperatures and under magnetic fields of up to 52 T, the quantum limit of SrRuO3 manifests the chiral anomaly of the Weyl nodes. …”
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A Review on Low-Dimensional Nanomaterials: Nanofabrication, Characterization and Applications by Paras, Kushal Yadav, Prashant Kumar, Dharmasanam Ravi Teja, Sudipto Chakraborty, Monojit Chakraborty, Soumya Sanjeeb Mohapatra, Abanti Sahoo, Mitch M. C. Chou, Chi-Te Liang, Da-Ren Hang

“…Owing to their nanoscale dimensions with possible quantum limit, nanomaterials and nanostructures possess a high surface-to-volume ratio, rich surface/interface effects, and distinct physical and chemical properties compared with their bulk counterparts, leading to the remarkably expanded horizons of their applications. …”
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Magnetic freeze-out and anomalous Hall effect in ZrTe5 by Adrien Gourgout, Maxime Leroux, Jean-Loup Smirr, Maxime Massoudzadegan, Ricardo P. S. M. Lobo, David Vignolles, Cyril Proust, Helmuth Berger, Qiang Li, Genda Gu, Christopher C. Homes, Ana Akrap, Benoît Fauqué

“…Abstract The ultra-quantum limit is achieved when a magnetic field confines an electron gas in its lowest spin-polarised Landau level. …”
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Phase Diffusion Mitigation in the Truncated Mach–Zehnder Interferometer by Quan Liao, Hongmei Ma, Liqing Chen, Weiping Zhang, Chun-Hua Yuan

“…The presence of phase diffusion noise may lead to the loss of quantum measurement advantages, resulting in measurement results that cannot beat the standard quantum limit (SQL). Squeezing is considered an effective method for reducing the detrimental effect of phase diffusion on a measurement. …”
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Light-induced many-body correlations in ultracold gases by Hu, Jiazhong, Ph. D. Massachusetts Institute of Technology

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Distributed quantum sensing using continuous-variable multipartite entanglement by Zhuang, Quntao, Shapiro, Jeffrey H, Zhang, Zheshen

“…By dividing a squeezed-vacuum state between multiple homodyne-sensor nodes using a lossless beam-splitter array, we obtain a root-mean-square (rms) estimation error that scales inversely with the number of nodes (Heisenberg scaling), whereas the rms error of a distributed sensor that does not exploit entanglement is inversely proportional to the square root of the number of nodes (standard quantum limit scaling). Our sensor's scaling advantage is destroyed by loss, but it nevertheless retains an rms-error advantage in settings in which there is moderate loss. …”
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Unified treatment of light-induced effects for atomic ensemble in optical cavities by Li, Zeyang(Physicist)Massachusetts Institute of Technology.

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Quasi-particle Breakdown and Heat Transport in a Homogeneous Strongly-interacting Fermi Gas by Yan, Zhenjie

“…The damping time scales of second sound and heat diffusion show a minimum diffusivity on the order of the quantum limit ♄/𝑚 for both modes. The diffusivity is observed to feature a peak at the phase transition temperature which is evidence for critical behavior, as seen in liquid ⁴He.…”
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Quantum noise and radiation pressure effects in high power optical interferometers by Corbitt, Thomas Randall

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Impact of backscattered light in a squeezing-enhanced interferometric gravitational-wave detector by Chua, S. S. Y., Sigg, D., Schofield, R. M. S., Frolov, V. V., Kawabe, K., Meadors, G. D., Factourovich, M., Gustafson, R., Vorvick, C., Landry, M., Khalaidovski, A., Stefszky, M. S., Mow-Lowry, Conor Malcolm, Buchler, B. C., Shaddock, D. A., Lam, P. K., Schnabel, R., McClelland, David E., Barsotti, Lisa, Evans, M., Mavalvala, Nergis, Dwyer, Sheila Elizabeth, Smith, Nicolas de Mateo

“…Squeezed states of light have been recently used to improve the sensitivity of laser-interferometric gravitational-wave detectors beyond the quantum limit. To completely establish quantum engineering as a realistic option for the next generation of detectors, it is crucial to study and quantify the noise coupling mechanisms which injection of squeezed states could potentially introduce. …”
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Nonequilibrium quantum fluctuations of a dispersive medium: Spontaneous emission, photon statistics, entropy generation, and stochastic motion by Maghrebi, Mohammad F., Jaffe, Robert L., Kardar, Mehran

“…As a result, we find a quantum limit on the uncertainty of the object's angular velocity in steady rotation. …”
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Study on manipulating photonic environment of emitters with scale dependent optical cavities by Hou, Songyan

“…Although it difficult to boost this interaction in individual single photon emitters, approaching the quantum limit of coherent interactions between individual quantum emitters and cavity resonators is crucial for fundamental quantum mechanics as well as practical applications. …”
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Room-temperature phonon-coupled single-photon emission in hexagonal boron nitride by Lai, Jia-Min, Tan, Qinghai, Song, Feilong, Chang, Haonan, Lv, Yanpei, Liu, Xue-Lu, Teng, Jinghua, Gao, Weibo, Tan, Ping-Heng, Zhang, Jun

“…Photon-lattice (phonon) coupling is fundamental to light-matter interaction, particularly when it reaches the quantum limit of the phonon-coupled single-photon emission, which holds great potential for quantum manipulation and quantum information transduction. …”
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Development of coherent detector technologies for sub-millimetre wave astronomy observations by Tan, B, Dr. Boon Kok Tan

“…They have already achieved sensitivity approaching the quantum limit at frequencies below the superconducting gap of niobium (~680 GHz). …”

Quantum noise of non-ideal Sagnac speed meter interferometer with asymmetries by S L Danilishin, C Gräf, S S Leavey, J Hennig, E A Houston, D Pascucci, S Steinlechner, J Wright, S Hild

“…The speed meter concept has been identified as a technique that can potentially provide laser-interferometric measurements at a sensitivity level which surpasses the standard quantum limit (SQL) over a broad frequency range. As with other sub-SQL measurement techniques, losses play a central role in speed meter interferometers and they ultimately determine the quantum noise limited sensitivity that can be achieved. …”
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