Magnetic torque anomaly in the quantum limit of Weyl semimetals by Philip J. W. Moll, Andrew C. Potter, Nityan L. Nair, B. J. Ramshaw, K. A. Modic, Scott Riggs, Bin Zeng, Nirmal J. Ghimire, Eric D. Bauer, Robert Kealhofer, Filip Ronning, James G. Analytis

“…Here, Moll et al. report a distinctive anomaly in the magnetic torque upon entering quantum limit state in the Weyl semimetal NbAs, which only appears due to the presence of Weyl fermions.…”
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Quantum limit transport and destruction of the Weyl nodes in TaAs by B. J. Ramshaw, K. A. Modic, Arkady Shekhter, Yi Zhang, Eun-Ah Kim, Philip J. W. Moll, Maja D. Bachmann, M. K. Chan, J. B. Betts, F. Balakirev, A. Migliori, N. J. Ghimire, E. D. Bauer, F. Ronning, R. D. McDonald

“…Ramshaw et al. use high magnetic fields to drive TaAs into the quantum limit, finding evidence for the predicted chiral anomaly and an unanticipated increase in resistivity at the highest fields.…”
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Improved Quantum Magnetometry beyond the Standard Quantum Limit by J. B. Brask, R. Chaves, J. Kołodyński

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Approaching the standard quantum limit of mechanical torque sensing by P. H. Kim, B. D. Hauer, C. Doolin, F. Souris, J. P. Davis

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Special Issue on Quantum Limits to the Second Law of Thermodynamics by Daniel P. Sheehan, Alexey V. Nikulov

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Standard Quantum Limit for Probing Mechanical Energy Quantization by Danilishin, S. L., Chen, Yanbei, Miao, Haixing, Corbitt, Thomas R

“…We derive a standard quantum limit for probing mechanical energy quantization in a class of systems with mechanical modes parametrically coupled to external degrees of freedom. …”
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Quantum limits of stochastic cooling of a bosonic gas by Ivanov, D, Wallentowitz, S, Walmsley, I

Unconventional Hall response in the quantum limit of HfTe5 by S. Galeski, X. Zhao, R. Wawrzyńczak, T. Meng, T. Förster, P. M. Lozano, S. Honnali, N. Lamba, T. Ehmcke, A. Markou, Q. Li., G. Gu, W. Zhu, J. Wosnitza, C. Felser, G. F. Chen, J. Gooth

“…Here, the authors observe an unconventional Hall response in the quantum limit of the bulk semimetal HfTe5 with a plateau-like feature in the Hall conductivity.…”
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Beyond the standard quantum limit for parametric amplification of broadband signals by M. Renger, S. Pogorzalek, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe, K. G. Fedorov

“…Quantum mechanics sets an ultimate lower limit of half a photon to the added input noise for phase-preserving amplification of narrowband signals, also known as the standard quantum limit (SQL). This limit, which is equivalent to a maximum quantum efficiency of 0.5, can be overcome by employing nondegenerate parametric amplification of broadband signals. …”
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Quantum limit cycles and the Rayleigh and van der Pol oscillators by Lior Ben Arosh, M. C. Cross, Ron Lifshitz

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Quantum-limited determination of refractive index difference by means of entanglement by M. Reisner, F. Mazeas, R. Dauliat, B. Leconte, D. Aktas, R. Cannon, P. Roy, R. Jamier, G. Sauder, F. Kaiser, S. Tanzilli, L. Labonté

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Quantum imaging beyond the standard-quantum limit and phase distillation by Simon Schaffrath, Daniel Derr, Markus Gräfe, Enno Giese

“…In the high-gain regime, however, typical distillation techniques inherently forbid a scaling better than the standard-quantum limit, as a consequence of the photon statistics of squeezed vacuum. …”
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Integrated fiber optical receiver reducing the gap to the quantum limit by Horst Zimmermann, Bernhard Steindl, Michael Hofbauer, Reinhard Enne

“…These results are a major advance towards direct detection optical receivers working close to the quantum limit.…”
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Quantum limits for precisely estimating the orientation and wobble of dipole emitters by Oumeng Zhang, Matthew D. Lew

“…Extending our analysis to rotationally diffusing molecules, we derive conditions that enable a subset of second-order dipole orientation moments to be measured with quantum-limited precision. Interestingly, we find that no existing techniques can measure all second moments simultaneously with QFI-limited precision; there exists a fundamental trade-off between precisely measuring the mean orientation of a molecule versus its wobble. …”
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Scale-invariant spin dynamics and the quantum limits of field sensing by Morgan W Mitchell

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Observation of a thermoelectric Hall plateau in the extreme quantum limit by Skinner, Brian J, Kozii, Vladyslav, Fu, Liang

“…Here, we demonstrate that the thermoelectric Hall conductivity αxy in the three-dimensional Dirac semimetal ZrTe5 acquires a robust plateau in the extreme quantum limit of magnetic field. The plateau value is independent of the field strength, disorder strength, carrier concentration, or carrier sign. …”
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Theory of Spin-Split Cyclotron Resonance in the Extreme Quantum Limit by Cooper, N, Chalker, J

Tradeoff in simultaneous quantum-limited phase and loss estimation in interferometry by Crowley, P, Datta, A, Barbieri, M, Walmsley, I

“…However, depending on the parameters involved, the quantum limit for the simultaneous estimation of multiple parameters may not be attainable, leading to tradeoffs in the attainable precisions. …”

Approaching the quantum limit of precision in absorbance estimation using classical resources by Euan J. Allen, Javier Sabines-Chesterking, Alex R. McMillan, Siddarth K. Joshi, Peter S. Turner, Jonathan C. F. Matthews

“…Here we find if the length of an absorbing object is a controllable variable, then, via the Beer-Lambert law, classical strategies can be optimized to reach within 83% of the absolute quantum limit in precision. Our analysis includes experimental losses, detector noise, and input states with arbitrary photon statistics. …”
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Quantum limit for driven linear non-Markovian open-quantum-systems by Andrés F Estrada, Leonardo A Pachón

Subjects: “…quantum limit…”
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