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Alain Aspect, Jean Dalibard and Gérard Roger tested Bell inequalities using pairs of photons and rapidly changing polarization analyzers. An acousto-optical switch in each arm routed light toward one of two polarizers; switching near $50\mathrm{MHz}$ changed the effective setting on a timescale shorter than the photon transit time between the analyzers. The measured correlations violated the tested Bell inequality. These switches were driven at incommensurate frequencies, so their role should be distinguished from the independently randomized settings of later experiments.^[ref]

A physicist researching quantum optics and the foundations of quantum mechanics.^[ref]

Anton Zeilinger coauthored an experiment preparing GHZ states of three spatially separated photons. The distinguishing feature is the quantum coherence between the two three-photon alternatives: recording the same populations alone would also be compatible with an incoherent mixture. Measurements in additional polarization bases tested this distinction, making three-party entanglement an experimental resource for investigating local realism.^[ref]

A physicist researching quantum optics and quantum foundations.^[ref]

Dik Bouwmeester coauthored the 1997 optical demonstration of quantum teleportation. A joint Bell-state measurement on an input photon and one member of an entangled pair conditionally transferred the input polarization quantum state to the other member. The reported experiment selected a particular detected outcome. The process consumes the shared entanglement and requires classical information about the measurement result; it does not send a usable message faster than light.^[ref]

A physicist researching quantum optics and quantum information science.^[ref]

Fedor Jelezko works on solid-state quantum optics and spin control in diamond. His Ulm University CV identifies him in full and lists the exact 2004 nuclear-spin paper whose first-author byline is F. Jelezko, verifying the connection between the full name and the abbreviated record.^[ref]

That experiment addressed an electron spin coupled to a single Carbon-13 nuclear spin at a nitrogen-vacancy center. A laser initialized and read out the electron-spin-dependent signal, while microwave and radio frequency pulses manipulated the coupled levels. Nuclear-state changes were detected through the electron spin. The team observed nuclear Rabi oscillations and demonstrated a conditional two-qubit gate, providing a physical test of coherent control of an individually addressed spin system.^[ref]

For an original ideal pulse example, let a selected transition have resonant Rabi frequency $f_R=100\mathrm{kHz}$ and start entirely in one level. The two-level model gives transition probabilityA $2.5\mu \mathrm{s}$ pulse gives $P=1/2$, while a $5.0\mu \mathrm{s}$ pulse gives $P=1$. Scanning the pulse duration reveals an oscillation rather than a single population change. These are chosen ideal values; detuning, relaxation and readout noise limit a real measurement.

Hermann Anton Haus was an electrical engineer whose research ranged from quantum optics to optical communication systems and ultrashort laser pulses. His work on optical solitons helped connect nonlinear wave propagation with the transmission of information through optical fibers.^[ref]

With James R. Melcher, he wrote Electromagnetic Fields and Energy by Hermann A. Haus and James R. Melcher, a text that links field equations with concrete devices and demonstrations. Its magnetic circuit analysis, for example, shows how geometry and constitutive assumptions turn an electromagnetic field problem into an approximate engineering model.^[ref]

Jeffrey Shapiro develops the quantum optics of optical information and communication. His teaching treatment of optical quadratures explains why a squeezed coherent state can reduce fluctuations of one measured field component while increasing those of its conjugate component. The Heisenberg uncertainty principle constrains their product, rather than requiring equal fluctuations in both components. Comparing these states with coherent states connects the mathematics of a quantum harmonic oscillator with the statistics of optical measurements.^[ref]

Lecturer named on the cover of Quantum Optical Communication lecture 6 by Jeffrey H. Shapiro.

A physicist working on quantum optics and the limits of optical resolution. With Ranjith Nair and Xiao-Ming Lu, he showed that the difficulty of estimating the separation of two nearby, mutually incoherent sources depends on the measurement: suitable linear optics and photon counting retain information lost by ordinary imaging. This makes the Rayleigh criterion a limitation of a particular imaging method rather than a universal precision bound.^[ref]

Matteo G. A. Paris is a theoretical physicist working on quantum information, quantum optics and quantum measurement. His article Quantum estimation for quantum technology by Matteo G. A. Paris explains how to estimate quantities encoded in a quantum state when a direct measurement of the desired parameter is unavailable.

The treatment uses the symmetric logarithmic derivative and Quantum Fisher information to bound attainable precision and compare measurement strategies. It connects the choice of measurement with statistical estimation, rather than assuming that repeated observations automatically achieve the best possible accuracy.^[ref]

Institutional profile: www.unimi.it/it/ugov/person/matteo-paris.

Absorption of a gamma ray into an excited nuclear level followed by re-emission. The absorber-frame photon energy must overlap the absorption line; nuclear recoil, Doppler broadening and the natural decay width affect resonance. This nuclear process differs from atomic resonance fluorescence used in quantum optics.

The photon number probabilities of a coherent state form a Poisson distribution with mean $\mu =|\alpha {|}^2$. Alternatively normal ordering gives $⟨\hat{n}(\hat{n}-1)⟩=⟨{\hat{a}}^{†2}{\hat{a}}^2⟩=|\alpha {|}^4$. ThusThe last ratio is defined only for nonzero $\alpha$. At large $|\alpha |$ the absolute fluctuation grows but its size relative to the mean becomes negligible. This is the deterministic intensity limit within quantum optics; it does not assert the disappearance of vacuum-scale quadrature noise.

Quantum optics studies light using quantum states of the electromagnetic field and their interaction with matter. Photon statistics asks how detections fluctuate; the quantum theory of optical coherence relates those detections to field correlations. A coherent state, thermal light, and a Fock state can have the same mean photon number yet different pair counts. This distinction makes photon counting useful for testing sources intended to emit one photon at a time.

A researcher in quantum optics, and coauthor with Mankei Tsang and Xiao-Ming Lu of a 2016 theory of resolving two incoherent light sources. Their result concerns estimating a separation even when the intensity images overlap: changing the optical measurement can preserve precision that ordinary imaging loses. Possible applications include distinguishing nearby stars.^[ref]

A researcher in quantum optics whose joint work on Rydberg excitons connects highly excited atomic states with optical excitations in semiconductors. The 2014 study found evidence of Rydberg blockade: the presence of one large exciton suppresses the creation of another nearby.^[ref]

A researcher in quantum optics who coauthored the 2016 analysis of two-source optical resolution with Mankei Tsang and Ranjith Nair. Their analysis connects measurement design to the precision of separation estimates, explaining why overlapping images need not imply indistinguishable source positions.^[ref]