2 results
The talk explores a quantitative connection between Huygens’s legacies in wave optics and classical mechanics. Optical polarization, coherence and entanglement are related to mechanical quantities including centre of mass and moment of inertia. Distributions of classical point masses provide a representation of nonseparability in optical fields, and the correspondence extends to quantum states of two qubits. These mappings offer an intuitive way to examine entanglement and the shared mathematical structure of mechanics, classical optics and quantum physics.
Mon, Nov 16 · 17:15 UTC · Online
Water’s rapidly changing hydrogen-bond network links molecular interactions to its unusual bulk properties. The talk introduces correlated vibrational spectroscopy (CVS), which combines higher-order optical measurements, symmetry selection and angular polarimetry to isolate signals from interacting molecules and directly examine low-frequency hydrogen-bond stretching. CVS measurements reveal electronic charge transfer and nuclear quantum effects in water and acidic or basic solutions. Hydroxide donates roughly 8% more negative charge to the network than water, while protons reduce transfer by less than 4%. Nuclear quantum effects weaken hydrogen bonds in pure water by about 10% and change charge transfer in acidic, but not basic, solutions. In acids, charge is accepted locally by a proton and reduced by its delocalization. In bases, donation extends across several hydration shells, beyond the region affected by proton delocalization. The presentation explains how these measurements probe intermolecular correlations and concludes with further applications of CVS.
Wed, Nov 18 · 15:00 UTC · Online
Tracy Northup explains how interactions between trapped atomic ions and single photons transfer quantum information between matter and light. Atom–photon entanglement can connect distant ions, as demonstrated by a prototype linking calcium ions across 230 metres. The seminar considers how larger networks could support secure communications, distributed computation and connected quantum sensors.
Recorded
Quantum networks require links between stored qubits and information carried by travelling waves. This lecture compares interfaces coupling atoms, spins and superconducting circuits to optical or acoustic signals. It also introduces quantum memories, the measurements used to assess their performance, recent experimental results and applications that combine communication with quantum processing.
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Vibrations can destroy quantum coherence, but they can also carry useful quantum information. This lecture examines both roles of phonons, including methods for reducing unwanted coupling to solid-state qubits. It introduces optical control of mechanical motion in the quantum regime and discusses applications to precision sensing, connections between different quantum systems and fundamental physics.
Recorded
Gerhard Rempe explores how to create useful entanglement across many qubits. Individual atoms in an optical cavity generate photons with controllable graph-shaped entanglement patterns. The seminar examines the experimental challenge of producing these states on demand and their potential for photonic error correction, quantum computation and communication that tolerates photon loss.
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Photonic quantum processors use interference between indistinguishable photons to manipulate information. This lecture reviews proposed architectures and experiments involving several dozen photons. It then examines measurement-based computation as a route toward larger systems, including highly entangled light, error correction, distributed processing and possible integration with spin qubits.
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Reliable photon sources are essential for optical quantum communication and computation. This lecture compares single-photon generation through nonlinear optical processes with controlled emission from individual atoms. It discusses performance, limitations and integration, then extends the comparison to sources of entangled photons and more elaborate quantum states of light.
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