The device, depicted in Fig. 1a, comprises two misaligned photonic crystal slabs stacked in free space. These two crystals comprise of a stack of 1D gratings. This configuration allows for a tunable diffraction pattern with the misalignment…
Category: 4. Physics
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After 50 Years, a Neutrino Detector Finally Catches Elusive Ghost Particles
For decades, scientists struggled to catch neutrinos—tiny, nearly invisible particles that pass through everything, including Earth itself. Now, a breakthrough has arrived: using a detector the size of a lunchbox, researchers have finally…
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Quantum Breakthrough: Scientists Find “Backdoor” to 60-Year-Old Superconducting Mystery
A Copenhagen team has unlocked a clever “backdoor” into studying rare quantum states once thought beyond reach. Scientists at the Niels Bohr Institute, University of Copenhagen, have discovered a new approach for investigating rare quantum…
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Game-Theory Paradox Inspires Cancer Therapy
• Physics 18, 144
Simulations suggest that the combination of two cancer-therapy strategies, which individually deliver poor outcomes, might produce optimal results.
Yoona/stock.adobe.com
A paradox from game… Continue Reading
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Bridging the Quantum Frequency Gap
• Physics 18, s94
A new device can freely and efficiently change the frequency of microwave signals, enabling communication between otherwise incompatible quantum systems.
Many quantum technologies require microwave…
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Quantum Leap in Measurement: New System Nears the Theoretical Limit of Physics
Fast, precise, and ready for use in the field: a quantum-level optical frequency comb system capable of measuring 0.34 nanometers in just 25 microseconds. The Korea Research Institute of Standards and Science has developed a cutting-edge system…
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Is the Multiverse Real? New Quantum Tech Might Finally Tell Us
Imagine a gamma ray laser that safely eliminates cancer cells while leaving healthy tissue unharmed. A University of Colorado Denver engineer is close to providing researchers with a powerful new tool that could bring science fiction concepts…
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High-accuracy laser spectroscopy of $${{\bf{H}}}_{{\bf{2}}}^{{\boldsymbol{+}}}$$ and the proton–electron mass ratio
Details of the experiment
We use the same apparatus that we used in our previous work20 to perform laser spectroscopy of an E2 transition in \({{\rm{H}}}_{2}^{+}\) and HD+. We prepare a cluster of trapped and sympathetically cooled molecular ions,…
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High-Tc 2D ambient BCS superconductors in hydrogenated transition-metal borides
Crystal structures
The crystal structure of the M2B2H4 monolayer is illustrated in Fig. 1. Layered M2B2H4 adopts a 3D hexagonal structure with a space group symmetry of P6/mmm, analogous to Mg2B2. Figure 1 presents the side view and top view of…
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Quantum-data-driven dynamical transition in quantum learning
Overview of results
Given a QNN \(\hat{U}({\boldsymbol{\theta }})\) with L variational parameters θ = (θ1, …, θL), we consider a supervised learning task involving N quantum data \({\{\vert {\psi }_{\alpha }\rangle \}}_{\alpha = 1}^{N}\),…
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