Magnetic field induced competing phases in spin-orbital entangled Kitaev magnets by Li Ern Chern, Ryui Kaneko, Hyun-Yong Lee, Yong Baek Kim

“…Given the highly frustrated nature of the spin model, the large unit cell orders are likely to melt into the putative spin liquid in the quantum limit. Our work provides an important basis for a thorough investigation of emergent spin liquids and competing phases in Kitaev magnets.…”
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Quantum-enhanced Doppler lidar by Maximilian Reichert, Roberto Di Candia, Moe Z. Win, Mikel Sanz

“…In two of them, a quantum advantage exceeding the standard quantum limit is achieved assuming no photon losses. …”
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Revisiting the impact of dissipation on time-reversed one-axis-twist quantum-sensing protocols by Martin Koppenhöfer, A. A. Clerk

“…Spin squeezing can increase the sensitivity of interferometric measurements of small signals in large spin ensembles beyond the standard quantum limit. In many practical settings, the ideal metrological gain is limited by imperfect readout of the sensor. …”
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Bayesian minimum mean square error for transmissivity sensing by Boyu Zhou, Boulat A. Bash, Saikat Guha, Christos N. Gagatsos

“…To our knowledge, these results on transmissivity estimation with quantum-limited precision represent the first Bayesian analysis of the problem.…”
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Asymptotic Phase and Amplitude for Classical and Semiclassical Stochastic Oscillators via Koopman Operator Theory by Yuzuru Kato, Jinjie Zhu, Wataru Kurebayashi, Hiroya Nakao

“…We show that the proposed definition gives appropriate values of the phase and amplitude for strongly stochastic limit-cycle oscillators, excitable systems undergoing noise-induced oscillations, and also for quantum limit-cycle oscillators in the semiclassical regime.…”
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Spin transport in a Mott insulator of ultracold fermions by Nichols, Matthew A, Cheuk, Lawrence W, Okan, Melih, Hartke, Thomas R, Mendez, Enrique, Senthil, T, Khatami, Ehsan, Zhang, Hao, Zwierlein, Martin W

“…For strong interactions, spin diffusion is driven by super-exchange and doublon-hole-assisted tunneling, and strongly violates the quantum limit of charge diffusion.The technique developed in this work can be extended to finite doping, which can shed light on the complex interplay between spin and charge in the Hubbard model.…”
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Quantum Optical Temporal Phase Estimation by Homodyne Phase-Locked Loops by Tsang, Mankei, Shapiro, Jeffrey H., Lloyd, Seth

“…Using classical estimation techniques, we design homodyne phase-locked loops for optical temporal phase and instantaneous frequency measurements at the quantum limit.…”
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High-field immiscibility of electrons belonging to adjacent twinned bismuth crystals by Ye, Y, Yamada, A, Kinoshita, Y, Wang, J, Nie, P, Xu, L, Zuo, H, Tokunaga, M, Harrison, N, McDonald, RD, Suslov, AV, Ardavan, A, Nam, M-S, LeBoeuf, D, Proust, C, Fauqué, B, Fuseya, Y, Zhu, Z, Behnia, K

“…Moreover, twin boundaries further complexify the interpretation of the data by producing extra anomalies in the extreme quantum limit. Here, we present a study of angle dependence of magnetoresistance up to 65 T in bismuth complemented with Nernst, ultrasound, and magneto-optic data. …”

Squeezed states generation by nonlinear plasmonic waveguides: a novel analysis including loss, phase mismatch and source depletion by Hamid Nadgaran, Mohammad Amin Izadi, Rahman Nouroozi

“…This new method of squeezed states generation may find applications in optical communication with a noise level well below the standard quantum limit, in quantum teleportation, and in super sensitive interferometry.…”
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Machine Learning for Quantum Metrology by Nicolò Spagnolo, Alessandro Lumino, Emanuele Polino, Adil S. Rab, Nathan Wiebe, Fabio Sciarrino

“…Here, we discuss an asymptotically optimal, machine learning based, adaptive single-photon phase estimation protocol that allows us to reach the standard quantum limit when a very limited number of photons is employed.…”
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Quantum secure metrology for network sensing-based applications by Muhammad Talha Rahim, Awais Khan, Uman Khalid, Junaid ur Rehman, Haejoon Jung, Hyundong Shin

“…This paper proposes a QSM scheme that employs Bell pairs to provide unconditional security while offering precision scaling beyond the standard quantum limit. We provide a detailed comparative performance analysis of our proposal under multiple attacks. …”
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Quantum metrology for the Ising Hamiltonian with transverse magnetic field by Michael Skotiniotis, Pavel Sekatski, Wolfgang Dür

“…Moreover, we numerically observe that the optimal precision using a product input state scales at the standard quantum limit.…”
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Entangled photons enabled time-frequency-resolved coherent Raman spectroscopy and applications to electronic coherences at femtosecond scale by Zhedong Zhang, Tao Peng, Xiaoyu Nie, Girish S. Agarwal, Marlan O. Scully

“…This suggests new paradigms of optical signals and spectroscopy, with potential to push detection below standard quantum limit.…”
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Generation of pulsed bipartite entanglement using four-wave mixing by Quentin Glorieux, Jeremy B Clark, Neil V Corzo, Paul D Lett

“…We report a noise reduction of up to 3.8 ± 0.2 dB below the standard quantum limit in the pulsed regime and a level of entanglement that violates an Einstein–Podolsky–Rosen inequality.…”
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Semi-classical simulation of spin-1 magnets by Kimberly Remund, Rico Pohle, Yutaka Akagi, Judit Romhányi, Nic Shannon

“…Theoretical studies of magnets have traditionally concentrated on either classical spins, or the extreme quantum limit of spin-1/2. However, magnets built of spin-1 moments are also intrinsically interesting, not least because they can support quadrupole, as well as dipole moments, on a single site. …”
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Quantum sensing using multiqubit quantum systems and the Pauli polytope by Irma Avdic, LeeAnn M. Sager-Smith, Indranil Ghosh, Olivia C. Wedig, Jacob S. Higgins, Gregory S. Engel, David A. Mazziotti

“…However, achieving high fidelity and control of entangled qubits that enables sensing beyond the quantum limit is still a challenging endeavor. In this paper, we present an alternative approach to quantum sensing, which we call open-system quantum sensing, where we exploit a generalization of the Pauli exclusion principle to sense the openness of a multiqubit quantum system from only measurement of the qubit occupations. …”
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Optimal Estimation of Quantum Coherence by Bell State Measurement: A Case Study by Yuan Yuan, Xufeng Huang, Yueping Niu, Shangqing Gong

“…The numerical results show that Bell state measurement is the optimal measurement for estimating several frequently-used coherence quantifiers, and it has been demonstrated in the perspective of the quantum limit of semiparametric estimation and Fisher information.…”
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Improving Broadband Displacement Detection with Quantum Correlations by N. S. Kampel, R. W. Peterson, R. Fischer, P.-L. Yu, K. Cicak, R. W. Simmonds, K. W. Lehnert, C. A. Regal

“…In a typical measurement configuration, the trade-off between the probe’s shot noise (imprecision) and its quantum backaction results in what is known as the standard quantum limit (SQL). In this work, we investigate how quantum correlations accessed by modifying the readout of the interferometer can access physics beyond the SQL and improve displacement sensitivity. …”
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Stern-Gerlach Interferometry for Tests of Quantum Gravity and General Applications by Yash Lokare

“…Over the years, several proposals have been put forward that seek to use Stern-Gerlach and/or matter-wave interferometry as a tool for a myriad of applications of general interest, some of which include tests for fundamental physics (viz., quantum wave-function collapse, stringent tests for the Einstein equivalence principle at the quantum scale, breaking the Standard Quantum Limit (SQL) barrier, and so forth), precision sensing, quantum metrology, gravitational wave detection and inertial navigation. …”
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Quantum noise and its evasion in feedback oscillators by Loughlin, Hudson A., Sudhir, Vivishek

“…Our analysis clarifies the quantum limits to the stability of feedback oscillators in general, derives a standard quantum limit (SQL) for all such devices, and quantifies the efficacy of quantum strategies in realizing sub-SQL oscillators.…”
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