A Broadband Signal Recycling Scheme for Approaching the Quantum Limit from Optical Losses by Teng Zhang, Joe Bentley, Haixing Miao

“…Given the state-of-the-art optics, the optical losses define the lower bound of the best possible quantum-limited detector sensitivity. In this work, we come up with a broadband signal recycling scheme which gives a potential solution to approaching this lower bound by converting the signal recycling cavity to be a broadband signal amplifier using an active optomechanical filter. …”
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The reverse quantum limit and its implications for unconventional quantum oscillations in YbB12 by Christopher A. Mizzi, Satya K. Kushwaha, Priscila F. S. Rosa, W. Adam Phelan, David C. Arellano, Lucas A. Pressley, Tyrel M. McQueen, Mun K. Chan, Neil Harrison

“…Abstract The quantum limit in a Fermi liquid, realized when a single Landau level is occupied in strong magnetic fields, gives rise to unconventional states, including the fractional quantum Hall effect and excitonic insulators. …”
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Proposal for a continuous wave laser with linewidth well below the standard quantum limit by Chenxu Liu, Maria Mucci, Xi Cao, M. V. Gurudev Dutt, Michael Hatridge, David Pekker

“…Here, the authors show theoretically that the linewidth can be reduced below the standard quantum limit by engineering the output coupling of a laser to reduce noise, and discuss the potential practical implementation of this approach.…”
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Metallization-Induced Quantum Limits of Contact Resistance in Graphene Nanoribbons with One-Dimensional Contacts by Mirko Poljak, Mislav Matić

“…We calculate the intrinsic quantum limit of width-normalized <i>R_C</i> and find that the limit depends on GNR dimensions, decreasing with width downscaling to ~21 Ω∙µm in 0.4 nm-wide GNRs, and increasing with length downscaling up to ~196 Ω∙µm in 5 nm-long GNRs. …”
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Proposal for gravitational-wave detection beyond the standard quantum limit through EPR entanglement by Ma, Yiqiu, Miao, Haixing, Pang, Belinda Heyun, Evans, Matthew J, Zhao, Chunnong, Harms, Jan, Schnabel, Roman, Chen, Yanbei

“…In continuously monitored systems the standard quantum limit is given by the trade-off between shot noise and back-action noise. …”
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Phase measurement beyond the standard quantum limit using a quantum neuromorphic platform by Krisnanda, Tanjung, Ghosh, Sanjib, Paterek, Tomasz, Laskowski, Wiesław, Liew, Timothy Chi Hin

“…We demonstrate phase precision scaling following the standard quantum limit, the Heisenberg limit, and beyond. This can be achieved using quantum resource states such as NOON states or other entangled states, however, we also find that classically correlated mixtures of states are alone sufficient, provided that they exhibit quantum coherence. …”
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QUASI-PARTICLE RECOMBINATION AND SPATIAL ORDERING OF 2D ELECTRONS IN THE EXTREME QUANTUM LIMIT by Harris, I, Davies, H, Ford, R, Ryan, J, Turberfield, A, Foxon, C, Harris, J

Large gain quantum-limited qubit measurement using a two-mode nonlinear cavity by S Khan, R Vijay, I Siddiqi, A A Clerk

“…We demonstrate that this setup is capable in the standard linear-response regime of both producing a highly amplified output signal while at the same time achieving near quantum-limited performance: the measurement backaction on the qubit is near the minimal amount required by the uncertainty principle. …”
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Quantum-limit phenomena and band structure in the magnetic topological semimetal EuZn2As2 by Joanna Blawat, Smita Speer, John Singleton, Weiwei Xie, Rongying Jin

“…Abstract The interplay between magnetism and electronic topology in the quantum limit is a forefront subject of condensed matter physics. …”
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Magnetic field sensing beyond the standard quantum limit using 10-spin noon states by Jones, J, Karlen, S, Fitzsimons, J, Ardavan, A, Benjamin, S, Briggs, G, Morton, J

Magnetic field sensing beyond the standard quantum limit using 10-spin NOON states. by Jones, J, Karlen, S, Fitzsimons, J, Ardavan, A, Benjamin, S, Briggs, G, Morton, J

NEW PHASES OF THE 2D ELECTRON-SYSTEM IN THE ULTRA-QUANTUM LIMIT OBSERVED BY CYCLOTRON-RESONANCE by Summers, G, Warburton, R, Michels, J, Nicholas, R, Harris, J, Foxon, C

High-field drift velocity limitation in quasi-2D nanostructures (1D quantum limit) / by Mohammad Taghi Ahmadi, author, Razali Ismail, 1960-, author, Vijay Kumar Arora, author, Ismail Saad, 1974-, author, Proceedings of the 2nd Conference on Nanostructures (NS2008) (2008: Kish Island, Iran)

Application of quantum-limited optical time transfer to space-based optical clock comparisons and coherent networks by Emily D. Caldwell, Laura C. Sinclair, Jean-Daniel Deschenes, Fabrizio Giorgetta, Nathan R. Newbury

“…In this paper, we estimated the projected performance of these two applications using quantum-limited optical time transfer and assuming existing low-size, low-weight, and low-power hardware. …”
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Instantaneous phase synchronization of two decoupled quantum limit-cycle oscillators induced by conditional photon detection by Yuzuru Kato, Hiroya Nakao

“…We derive the analytical upper bounds for the increases in the quantum entanglement and phase coherence by conditional photon detection in the quantum limit.…”
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High Dynamic Range Imaging at the Quantum Limit with Single Photon Avalanche Diode-Based Image Sensors by Neale A.W. Dutton, Tarek Al Abbas, Istvan Gyongy, Francescopaolo Mattioli Della Rocca, Robert K. Henderson

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Transmon qubit readout fidelity at the threshold for quantum error correction without a quantum-limited amplifier by Liangyu Chen, Hang-Xi Li, Yong Lu, Christopher W. Warren, Christian J. Križan, Sandoko Kosen, Marcus Rommel, Shahnawaz Ahmed, Amr Osman, Janka Biznárová, Anita Fadavi Roudsari, Benjamin Lienhard, Marco Caputo, Kestutis Grigoras, Leif Grönberg, Joonas Govenius, Anton Frisk Kockum, Per Delsing, Jonas Bylander, Giovanna Tancredi

“…We perform single-shot frequency-multiplexed qubit readout, with a 140 ns readout time, and demonstrate 99.5% assignment fidelity for two-state readout and 96.9% for three-state readout–without using a quantum-limited amplifier.…”
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ZEEMAN SPLITTING IN THE EXTREME QUANTUM LIMIT THROUGH CYCLOTRON-RESONANCE ON 2-DIMENSIONAL GAAS AT HIGH-PRESSURE by Daly, M, Warburton, R, Michels, J, Nicholas, R, Harris, J, Foxon, C

“…Cyclotron resonance measurements on a GaAs heterojunction in the extreme quantum limit are presented. It has been reported recently that a new splitting appears for filling factors less than 1/6. …”

Strong coupling of magnons in a YIG sphere to photons in a planar superconducting resonator in the quantum limit. by Morris, RGE, van Loo, AF, Kosen, S, Karenowska, AD

“…The measurements are extended to the quantum limit by reducing the drive power until, on average, less than one photon is present in the CPWR. …”

Linear magnetoconductivity in an intrinsic topological Weyl semimetal by Song-Bo Zhang, Hai-Zhou Lu, Shun-Qing Shen

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