Classical Time Crystals by Shapere, Alfred, Wilczek, Frank

“…We consider the possibility that classical dynamical systems display motion in their lowest-energy state, forming a time analogue of crystalline spatial order. …”
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Classical Imaging with Undetected Photons by Shapiro, Jeffrey H., Venkatraman, Dheera, Wong, Franco N. C.

“…Owing to its much higher signal-to-noise ratio, our bright-source classical imager could greatly reduce image-acquisition time compared to that of Barreto Lemos et al.…”
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On the Convergence of Classical Variational Inequality Algorithms by Magnanti, Thomas L., Perakis, Georgia

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Quantum Cryptography Approaching the Classical Limit by Weedbrook, Christian, Pirandola, Stefano, Lloyd, Seth, Ralph, Timothy C.

“…We consider the security of continuous-variable quantum cryptography as we approach the classical limit, i.e., when the unknown preparation noise at the sender’s station becomes significantly noisy or thermal (even by as much as 10 (superscript 4) times greater than the variance of the vacuum mode). …”
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Qualitative and Quantitative Knowledge in Classical Mechanics by Kleer, Johan De

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Automated Reasoning About Classical Mechanics by Wong, Leon

“…This paradigm offers several advantages over methods that have become popular in the field, and seems promising for reasoning about a wide variety of classical mechanics problems.…”
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Advice coins for classical and quantum computation by Aaronson, Scott, Drucker, Andrew Donald

“…We study the power of classical and quantum algorithms equipped with nonuniform advice, in the form of a coin whose bias encodes useful information. …”
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Classic Nintendo Games Are (Computationally) Hard by Aloupis, Greg, Demaine, Erik D., Guo, Alan, Viglietta, Giovanni

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The critical window for the classical Ramsey-Turán problem by Fox, Jacob, Loh, Po-Shen, Zhao, Yufei

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A Classical Limit of Noumi's q-Integral Operator by Remenik, Daniel, Borodin, Alexei, Corwin, Ivan

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Classical generalization bounds are surprisingly tight for Deep Networks by Liao, Qianli, Miranda, Brando, Hidary, Jack, Poggio, Tomaso

“…The observation, motivated by a previous theoretical analysis of overparameterization and overfitting, not only demonstrates the validity of classical generalization bounds for deep learning but suggests that they are tight. …”
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One-Shot Classical-Quantum Capacity and Hypothesis Testing by Wang, Ligong, Renner, Renato

“…The one-shot classical capacity of a quantum channel quantifies the amount of classical information that can be transmitted through a single use of the channel such that the error probability is below a certain threshold. …”
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Three-sphere free energy for classical gauge groups by Mezei, Mark Koppany, Pufu, Silviu

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Misinference of interaction-free measurement from a classical system by Bush, John W. M., Frumkin, Valeri

“…As such, it represents one of the most beguiling of quantum phenomena. Here, we present a classical analog of interaction-free measurement using the hydrodynamic pilotwave system, in which a droplet self-propels across a vibrating fluid surface, guided by a wave of its own making. …”
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Closed timelike curves make quantum and classical computing equivalent by Aaronson, Scott, Watrous, John

“…In this paper, we show that, if CTCs existed, quantum computers would be no more powerful than classical computers: both would have the (extremely large) power of the complexity class polynomial space (Graphic), consisting of all problems solvable by a conventional computer using a polynomial amount of memory. …”
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Capacity of Quantum Erasure Channel Assisted by Backwards Classical Communication by Leung, Debbie W., Lim, Joungkeun, Shor, Peter W.

“…The upper bound is smaller than the capacity of the erasure channel when it is assisted by two-way classical communication. Thus, we prove the separation between quantum capacities assisted by backward classical communication and two-way classical communication.…”
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The influence of dissipation on the quantum-classical correspondence: Stability of stochastic trajectories by Kryvohuz, Maksym, Cao, Jianshu

“…The quantum-classical correspondence in the presence of dissipation is studied. …”
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Estimators for Persistent and Possibly Non-Stationary Data with Classical Properties by Gorodnichenko, Yuriy, Mikusheva, Anna, Ng, Serena

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Phase-sensitive coherence and the classical-quantum boundary in ghost imaging by Erkmen, Baris I., Hardy, Nicholas David, Venkatraman, Dheera, Wong, Franco N. C., Shapiro, Jeffrey H.

“…However, their seemingly quantum features have been mimicked with classical-state light, questioning wherein lies the classical-quantum boundary. …”
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Direct visualization of terahertz electromagnetic waves in classic experimental geometries by Werley, Christopher Alan, Nelson, Keith Adam, Tait, C. Ryan

“…The terahertz frequency waves were generated and detected in LiNbO3 crystals structured to reproduce classic optical geometries and experiments, such as two-slit interference and diffraction from a grating. …”
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