Quantum correlations between light and the kilogram-mass mirrors of LIGO by Yu, Haocun, McCuller, Lee P, Tse, Maggie, Barsotti, Lisa, Mavalvala, Nergis, Evans, M., Fernandez Galiana, Alvaro-Miguel, Fritschel, Peter K, Matichard, Fabrice, Whittle, Christopher Mark, Buikema, Aaron, Biscans, Sebastien, Gras, Slawomir, Lane, B. B., MacInnis, Myron E, Mansell, Georgia, Mason, Kenneth R, Massinger, Thomas J., Mittleman, Richard K, Weiss, Rainer, Yu, Hang, Zucker, Michael E

“…The measurement of minuscule forces and displacements with ever greater precision is inhibited by the Heisenberg uncertainty principle, which imposes a limit to the precision with which the position of an object can be measured continuously, known as the standard quantum limit1–4. When light is used as the probe, the standard quantum limit arises from the balance between the uncertainties of the photon radiation pressure applied to the object and of the photon number in the photoelectric detection. …”
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Phase Nanoscopy with Correlated Frequency Combs by Xiaobing Zhu, Matthias Lenzner, Jean-Claude Diels

“…Future data acquisition improvements are suggested that will bring the phase sensitivity exactly to the standard quantum limit, and beyond the quantum limit by squeezing.…”
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Geometric phase in quantum synchronization by Aaron Daniel, Christoph Bruder, Martin Koppenhöfer

“…We consider a quantum limit-cycle oscillator implemented in a spin system whose quantization axis is slowly rotated. …”
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Semiclassical phase reduction theory for quantum synchronization by Yuzuru Kato, Naoki Yamamoto, Hiroya Nakao

“…The developed framework enables us to analyze synchronization dynamics of quantum limit-cycle oscillators using the standard methods for classical limit-cycle oscillators in a quantitative way. …”
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Low-Noise Amplification and Frequency Conversion with a Multiport Microwave Optomechanical Device by C. F. Ockeloen-Korppi, E. Damskägg, J.-M. Pirkkalainen, T. T. Heikkilä, F. Massel, M. A. Sillanpää

“…High-gain amplifiers of electromagnetic signals operating near the quantum limit are crucial for quantum information systems and ultrasensitive quantum measurements. …”
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Photonic-Crystal Josephson Traveling-Wave Parametric Amplifier by Luca Planat, Arpit Ranadive, Rémy Dassonneville, Javier Puertas Martínez, Sébastien Léger, Cécile Naud, Olivier Buisson, Wiebke Hasch-Guichard, Denis M. Basko, Nicolas Roch

“…A microwave amplifier combining noise performances as close as possible to the quantum limit with large bandwidth and high saturation power is highly desirable for many solid-state quantum technologies. …”
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Quantum enhanced measurement of an optical frequency comb by Y. Cai, J. Roslund, V. Thiel, C. Fabre, N. Treps

“…In contrast to general single-parameter measurement schemes, we demonstrate here single shot multi-parameter estimation of an optical frequency comb at and beyond the standard quantum limit. The mean energy and the central frequency as well as the spectral bandwidth of ultrafast pulses are simultaneously determined with a multi-pixel spectrally resolved (MPSR) apparatus, without changing the photonics architecture. …”
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Entanglement tongue and quantum synchronization of disordered oscillators by Lee, Tony E., Chan, Ching-Kit, Wang, Shenshen

“…We study the synchronization of dissipatively coupled van der Pol oscillators in the quantum limit, when each oscillator is near its quantum ground state. …”
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Quantum pure noise-induced transitions: A truly nonclassical limit cycle sensitive to number parity by Andy Chia, Wai-Keong (Dariel) Mok, Changsuk Noh, Leong-Chuan Kwek

“…The noise-induced quantum limit cycle also exhibits other genuinely nonclassical traits, such as Wigner negativity and number-parity sensitive circulation in phase space. …”
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Active learning of quantum system Hamiltonians yields query advantage by Arkopal Dutt, Edwin Pednault, Chai Wah Wu, Sarah Sheldon, John Smolin, Lev Bishop, Isaac L. Chuang

“…Moreover, with access to prior information on a subset of Hamiltonian parameters and given the ability to select queries with linearly (or exponentially) longer system interaction times during learning, HAL can exceed the standard quantum limit and achieve Heisenberg (or super-Heisenberg) limited convergence rates during learning.…”
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Generation of squeezed light by multiphoton absorption in PTS-PDA by Ward, M, Goodson, T, Turner, K, Schucan, G, Donovan, K, Fox, A, Ryan, J

“…We observe fluctuations in the light transmitted through 400 mum thick single crystals to be reduced 11% below the standard quantum limit.…”

The design strain sensitivity of the schenberg spherical resonant antenna for gravitational waves by V. Liccardo, C. H. Lenzi, R. M. Marinho, O. D. Aguiar, C. Frajuca, F. da Silva Bortoli, C. A. Costa

“…We have come to the conclusion that the “ultimate” sensitivity of an advanced version of Schenberg antenna (aSchenberg) is around the standard quantum limit (although the parametric transducers used could, in principle, surpass this limit). …”
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Cyclotron resonance in ultra-low-hole-density narrow p-type GaAs/(Al,Ga)As quantum wells by Cole, B, Chamberlain, J, Henini, M, Cheng, T, Batty, W, Wittlin, A, Perenboom, J, Ardavan, A, Polisski, A, Singleton, J

“…The calculations use a rotated Luttinger Hamiltonian and invoke the axial approximation. In the quantum limit and at certain far-infrared energies we observe two resonances widely separated in field. …”

An elementary quantum network of entangled optical atomic clocks by Nichol, BC, Srinivas, R, Nadlinger, DP, Drmota, P, Main, D, Araneda, G, Ballance, CJ, Lucas, DM

“…Measurements on independent systems are limited by the standard quantum limit; measurements on entangled systems can surpass the standard quantum limit to reach the ultimate precision allowed by quantum theory—the Heisenberg limit. …”

Giant Seebeck effect across the field-induced metal-insulator transition of InAs by Alexandre Jaoui, Gabriel Seyfarth, Carl Willem Rischau, Steffen Wiedmann, Siham Benhabib, Cyril Proust, Kamran Behnia, Benoît Fauqué

“…Abstract Lightly doped III–V semiconductor InAs is a dilute metal, which can be pushed beyond its extreme quantum limit upon the application of a modest magnetic field. …”
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Squeezing collective atomic spins with an optical resonator by Leroux, Ian Daniel

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OPTICAL SPECTROSCOPY OF CORRELATED PHASES OF DEGENERATE 2-DIMENSIONAL ELECTRONS by Turberfield, A, Haynes, S, Wright, P, Ford, R, Clark, R, Ryan, J, Harris, J, Foxon, C

“…Optical evidence for the formation of an electron solid in the extreme quantum limit is presented. © 1992.…”

A Nonclassical Sagnac Interferometer Using Coherence de Broglie Waves by Byoung S. Ham

“…Here, a nonclassical version of a Sagnac interferometer is presented using completely different physics of coherence de Broglie waves (CBW) in a cavity, where CBW is a nonclassical feature overcoming the standard quantum limit governed by classical physics.…”
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Photoluminescence of GaAs/AlGaAs heterojunctions in magnetic fields up to 50 T by Priest, A, Nicholas, R, Cheng, H, Van der Burgt, M, Harris, J, Foxon, C

“…We report measurements of photo-luminescence from GaAs/AlGaAs heterojunctions in the ultra-quantum limit. New features are observed for low electron densities at high magnetic field, which we suggest are associated with the formation of negatively charged excitons, both singlet and triplet states. …”

QUANTUM CURRENT MODELLING ON GRAPHENE NANOSCROLLS by Mohammad Taghi. Ahmadi

“…In order to develop the new device types same as graphene nanoribbon, Carbon Nanotube Field Effect Transistor (CNTFET) and Nanowire, it is essential to investigate of quantum limit in low dimensional devices. In this paper quantum current of Monolayer Graphene Nanoscroll (MGNS) is modelled and the electronic properties due to the dependence on structural parameter are analyzed. …”
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