Spin-squeezing of ⁸⁷Rb via optical measurement by Schwab, Adele Ann

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Sub-Rayleigh-diffraction-bound quantum imaging by Giovannetti, Vittorio, Lloyd, Seth, Maccone, Lorenzo, Shapiro, Jeffrey H.

“…We show some N-photon strategies that permit resolution of details that are smaller than this bound, attaining either a 1∕√N enhancement (standard quantum limit) or a 1∕N enhancement (Heisenberg-like scaling) over standard techniques. …”
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Quantum state reconstruction and tomography using phase-sensitive light detection by Mello, Olivia L

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Reducing the Instability of an Optical Lattice Clock Using Multiple Atomic Ensembles by Xin Zheng, Jonathan Dolde, Shimon Kolkowitz

“…To this end, much optical atomic clock research has focused on reducing clock instability by increasing the atom number, lengthening the coherent interrogation times, and introducing entanglement to push beyond the standard quantum limit. In this work, we experimentally demonstrate an alternative approach to reducing clock instability using a phase estimation approach based on individually controlled atomic ensembles in a strontium (Sr) optical lattice clock. …”
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Low-energy structure of spiral spin liquids by Han Yan (闫寒), Johannes Reuther

“…Our paper sheds light on the nature of spiral spin liquids and also paves the way toward understanding their quantum limit.…”
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Optimal quantum states for frequency estimation by F Fröwis, M Skotiniotis, B Kraus, W Dür

“…For certain spatially and temporally correlated noise, we find that product states no longer allow one to reach the standard quantum limit in precision, while certain entangled states do. …”
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Ultralight dark matter detection with mechanical quantum sensors by Daniel Carney, Anson Hook, Zhen Liu, Jacob M Taylor, Yue Zhao

“…We consider the use of quantum-limited mechanical force sensors to detect ultralight (sub-meV) dark matter (DM) candidates which are weakly coupled to the standard model. …”
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Restoring Heisenberg scaling in noisy quantum metrology by monitoring the environment by Francesco Albarelli, Matteo A. C. Rossi, Dario Tamascelli, Marco G. Genoni

“…For finite detection efficiency, one falls back to the noisy standard quantum limit scaling, but with a constant enhancement due to an effective reduced dephasing. …”
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Evidence of compensated semimetal with electronic correlations at charge neutrality of twisted double bilayer graphene by Ayan Ghosh, Souvik Chakraborty, Unmesh Ghorai, Arup Kumar Paul, K. Watanabe, T. Taniguchi, Rajdeep Sensarma, Anindya Das

“…Using electrical and thermal transport, we find two orders of magnitude enhancement of the thermopower at magnetic fields much smaller than the extreme quantum limit, accompanied by large magnetoresistance ( ~ 2500%) at CNP, providing strong experimental evidence of compensated semimetallicity at CNP of TDBLG. …”
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Floquet-Mode Traveling-Wave Parametric Amplifiers by Kaidong Peng, Mahdi Naghiloo, Jennifer Wang, Gregory D. Cunningham, Yufeng Ye, Kevin P. O’Brien

“…Finally, we show that a Floquet-mode Josephson traveling-wave parametric amplifier implementation can simultaneously achieve >20dB gain and a QE of η/η_{ideal}>99.9% of the quantum limit over more than an octave of bandwidth. …”
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Near optimal discrimination of binary coherent signals via atom–light interaction by Rui Han, János A Bergou, Gerd Leuchs

“…We show that this scheme allows us to attain a probability of error extremely close to the Helstrom bound, the ultimate quantum limit for discriminating binary quantum states, through the simple Jaynes–Cummings interaction between the field and ancilla with optimized light–atom coupling and projective measurements on the atomic states. …”
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Dynamical decoupling leads to improved scaling in noisy quantum metrology by Pavel Sekatski, Michalis Skotiniotis, Wolfgang Dür

“…However, even for such parallel noise, one can achieve an improved scaling as compared to the standard quantum limit for any local noise by means of symmetrization. …”
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Optimal frequency measurements with quantum probes by Simon Schmitt, Tuvia Gefen, Daniel Louzon, Christian Osterkamp, Nicolas Staudenmaier, Johannes Lang, Matthew Markham, Alex Retzker, Liam P. McGuinness, Fedor Jelezko

“…For frequency estimation, we achieve a frequency sensitivity of 1.6 µHz/Hz2 for a 1.7 µT amplitude signal, which is within a factor of 2 from the quantum limit. Our results are foundational for discrimination and estimation problems in nanoscale nuclear magnetic resonance spectroscopy.…”
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Quantum metrology in local dissipative environments by Yuan-Sheng Wang, Chong Chen, Jun-Hong An

“…The metrology precision is raised from the standard quantum limit (SQL) to the Heisenberg limit (HL) by using entanglement. …”
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Absolute rotation detection by Coriolis force measurement using optomechanics by Sankar Davuluri, Yong Li

“…An analytic expression for the minimum detectable rotation rate corresponding to the standard quantum limit of measurable Coriolis force in the interferometer is derived. …”
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Irreversible Qubit-Photon Coupling for the Detection of Itinerant Microwave Photons by Raphaël Lescanne, Samuel Deléglise, Emanuele Albertinale, Ulysse Réglade, Thibault Capelle, Edouard Ivanov, Thibaut Jacqmin, Zaki Leghtas, Emmanuel Flurin

“…Single photon detection is a key resource for sensing at the quantum limit and the enabling technology for measurement-based quantum computing. …”
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Universal sound diffusion in a strongly interacting Fermi gas by Patel, Parth B, Yan, Zhenjie, Mukherjee, Biswaroop, Fletcher, Richard J, Struck, Julian, Zwierlein, Martin W

“…Here, we observe a universal quantum limit of diffusivity in a homogeneous, strongly interacting atomic Fermi gas by studying sound propagation and its attenuation through the coupled transport of momentum and heat. …”
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Geometric squeezing into the lowest Landau level by Fletcher, Richard J, Shaffer, Airlia, Wilson, Cedric C, Patel, Parth B, Yan, Zhenjie, Crépel, Valentin, Mukherjee, Biswaroop, Zwierlein, Martin W

“…We resolve the extent of zero-point cyclotron orbits and demonstrate geometric squeezing of the orbits’ centers 7 decibels below the standard quantum limit. The condensate attains an angular momentum exceeding 1000 quanta per particle and an interatomic distance comparable to the cyclotron orbit. …”
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Producing Squeezed Input States for an Atomic Clock Using an Optical Cavity by Leroux, Ian Daniel, Schleier-Smith, Monika Helene, Vuletic, Vladan

“…Spin squeezing, the generation of collective states of atomic ensembles with reduced spin noise by exploiting non-classical correlations between particles, is a promising approach to overcoming the standard quantum limit set by projection noise of independent atoms. …”
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States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty by Schleier-Smith, Monika Helene, Leroux, Ian Daniel, Vuletic, Vladan

“…By comparing the resulting reduction of quantum projection noise [up to 8.8(8) dB] with the concomitant reduction of coherence, we demonstrate a clock input state with spectroscopic sensitivity 3.0(8) dB beyond the standard quantum limit.…”
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