Absorption spectroscopy at the ultimate quantum limit from single-photon states by R Whittaker, C Erven, A Neville, M Berry, J L O’Brien, H Cable, J C F Matthews

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Quantum Limit for the Emittance of Dirac Particles Carrying Orbital Angular Momentum by Alessandro Curcio, Alessandro Cianchi, Massimo Ferrario

“…We apply our results to the evaluation of the quantum limit for emittance in particle accelerators. …”
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Imaging arbitrary incoherent source distributions with near quantum-limited resolution by Erik F. Matlin, Lucas J. Zipp

“…Abstract We demonstrate an approach to obtaining near quantum-limited far-field imaging resolution of incoherent sources with arbitrary distributions. …”
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Weyl Fermion magneto-electrodynamics and ultralow field quantum limit in TaAs by Lu, Zhengguang, Hollister, Patrick, Ozerov, Mykhaylo, Moon, Seongphill, Bauer, Eric D, Ronning, Filip, Smirnov, Dmitry, Ju, Long, Ramshaw, BJ

“…We determine the W2 Weyl point to be 8.3 meV below the Fermi energy, corresponding to a quantum limit—the field required to reach the lowest LL—of 0.8 tesla—unprecedentedly low for Weyl Fermions. …”
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On quantum limit of optical communications: Concatenated codes and joint-detection receivers by Guha, Saikat, Dutton, Zachary, Shapiro, Jeffrey H.

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16-QAM Quantum Receiver with Hybrid Structure Outperforming the Standard Quantum Limit by Zuo Yuan, Li Ke, Zhu Bing

“…Quantum receivers which can discriminate phase shift keying (PSK) and pulse position modulation (PPM) signals below the standard quantum limit have been proposed and some have been demonstrated experimentally. …”
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Experimental metrology beyond the standard quantum limit for a wide resources range by Valeria Cimini, Emanuele Polino, Federico Belliardo, Francesco Hoch, Bruno Piccirillo, Nicolò Spagnolo, Vittorio Giovannetti, Fabio Sciarrino

“…We quantitatively verify sub-standard quantum limit performances for a considerable range of N (O(30,000)) by using single-photon states with high-order orbital angular momentum, achieving an error reduction, in terms of the obtained variance, >10 dB below the standard quantum limit. …”
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Quantum-limited thermometry of a Fermi gas with a charged spin particle by Lorenzo Oghittu, Antonio Negretti

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From entropy to echoes: Counting the quasi-normal modes and the quantum limit of silence by Naritaka Oshita, Niayesh Afshordi

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Ultimate quantum limit for amplification: a single atom in front of a mirror by Emely Wiegand, Ping-Yi Wen, Per Delsing, Io-Chun Hoi, Anton Frisk Kockum

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Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate by Anand Bhattacharya, Brian Skinner, Guru Khalsa, Alexey V. Suslov

“…Here, Bhattacharya et al. report on electron transport in lightly-doped single crystals of SrTiO3deep in this extreme quantum limit.…”
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Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate by Bhattacharya, Anand, Khalsa, Guru, Suslov, Alexey V., Skinner, Brian J

“…When an electronic system is subjected to a sufficiently strong magnetic field that the cyclotron energy is much larger than the Fermi energy, the system enters the extreme quantum limit (EQL) and becomes susceptible to a number of instabilities. …”
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Towards spin squeezed ¹⁷¹Yb atomic clock beyond the standard quantum limit by Kawasaki, Akio, Ph. D. Massachusetts Institute of Technology

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Quantum Limit for Laser Interferometric Gravitational-Wave Detectors from Optical Dissipation by Miao, Haixing, Smith, Nicolas D., Evans, Matthew J

“…We derive a quantum limit to the sensitivity of laser interferometric gravitational-wave detectors from optical-loss-induced dissipation, analogous to the sensitivity limit from the mechanical dissipation. …”
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Difference-frequency generation with quantum-limited efficiency in triply-resonant nonlinear cavities by Burgess, Ian B., Rodriguez, Alejandro W., McCutcheon, Murray W., Bravo-Abad, Jorge, Zhang, Yinan, Johnson, Steven G., Loncar, Marko

“…We show that optimal “quantum-limited” conversion efficiency can be achieved at any pump power when the powers at the pump and idler frequencies satisfy a critical relationship. …”
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Quantum limited optical phase detection in a high power suspended interferometer by Lantz, Brian Thomas

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A 230-GHz endfire SIS mixer with near quantum-limited performance by Garrett, JD, Tan, B-K, Chaumont, C, Boussaha, F, Yassin, G

“…In this letter, we report the near quantum-limited performance of a 230 GHz endfire superconductor-insulator-superconductor (SIS) mixer utilizing a Nb/Al-AlOx/Nb trilayer. …”

CYCLOTRON-RESONANCE TO 100 MK OF A GAAS HETEROJUNCTION IN THE ULTRA-QUANTUM LIMIT by Michels, J, Hill, S, Warburton, R, Summers, G, Gee, P, Singleton, J, Nicholas, R, Foxon, C, Harris, J

Magnetic field sensing beyond the standard quantum limit under the effect of decoherence by Matsuzaki, Y, Benjamin, S, Fitzsimons, J

CYCLOTRON-RESONANCE OF MIXED PHASES OF THE 2-D SYSTEM IN THE ULTRA-QUANTUM LIMIT by Summers, G, Watts, M, Lewis, R, Nicholas, R, Harris, J, Foxon, C