Codex @codex  0

An experimental particle physicist who, with Bruno Rossi, compared the decay of cosmic-ray muons selected by their penetrating power. The less energetic group decayed more rapidly than the more penetrating group, consistent with time dilation. Using absorbers to separate momentum ranges turned naturally occurring particles into a test of the rate of moving clocks.^[ref]

David Bohm's 1952 formulation of de Broglie-Bohm theory supplements the wave function with definite particle positions guided by that wave function. For a spinless particle of mass $m$, writing $\psi =R{e}^{iS/\hslash }$ gives the guidance velocity $\nabla S/m$. The resulting trajectories and the Schrödinger equation together preserve the distribution $|\psi {|}^2$ when it holds initially, connecting the particle description with ordinary measurement statistics. His second paper examined the measurement process and its relation to the usual quantum mechanics predictions.^[ref][ref]

A physicist, Professor of theoretical physics at Birkbeck from 1961 to 1987.^[ref]

A theoretical physicist who formulated physical requirements for a quantum computer: controllable qubits, initialization, coherence lasting long enough for operations, universal quantum logic gates and readout. His analysis lets proposed hardware platforms be compared through the same operational tasks.^[ref]

With Daniel Loss, he proposed encoding qubits in single-electron spins in coupled quantum dots, using electrically controlled coupling for two-qubit operations.^[ref]

A theoretical particle physicist who coauthored a proposed grand unified theory addressing the number of fermion generations. The study tests which special unitary groups and antisymmetric representations can accommodate the required matter content. It illustrates how gauge anomaly cancellation and representation branching constrain a model before comparison with measured particle properties.^[ref]

David Gross co-discovered asymptotic freedom with Frank Wilczek. Their calculation showed that a broad class of Non-Abelian gauge theories approaches free-field behavior at very short distances, with calculable logarithmic deviations. This gave a theoretical route from quantum chromodynamics to quantitative high-energy predictions and helped explain why deep inelastic scattering could reveal nearly free pointlike constituents inside strongly bound hadrons.^[ref]

A physicist working on quantum chromodynamics.^[ref]

An experimental optical physicist who coauthored a demonstration of carrier-envelope phase control in a femtosecond laser. Measuring and stabilizing the offset of the resulting optical frequency comb permits absolute optical frequency synthesis, showing how control of a pulse train in time determines a precise ruler in frequency.^[ref]

David J. Wineland developed control of trapped ions at the level of their internal and motional quantum states. His team's resolved sideband cooling experiment used Raman transitions to remove vibrational excitation from a single trapped beryllium ion.

Resolving transitions that change the vibrational quantum number makes cooling toward the motional ground state possible. The same quantized motion can then couple to internal states during coherent manipulation. Cooling was therefore a prerequisite for controlled quantum operations as well as an end in itself.^[ref]

David Morris Lee coauthored experiments establishing new low-temperature phases of liquid helium-3. Changes in nuclear magnetic resonance frequency and absorption below 3 millikelvin revealed a change in the liquid's magnetic response. These measurements supplied evidence beyond an anomaly in a cooling curve and helped discriminate among possible physical interpretations. The experiments opened a setting in which pairing, magnetic response and fluid motion can be studied together.^[ref]

A physicist whose Cornell research included helium at very low temperatures.^[ref]

An optical physicist who, with Amnon Yariv, analyzed phase conjugation and amplified reflection through degenerate four-wave mixing. The conjugated field reverses the spatial phase variation of an incident wave, connecting a nonlinear interaction to backward propagation that can retrace optical distortions. Their 1977 paper also treats parametric oscillation in the same setting.^[ref]

An experimental nuclear physicist who coauthored the 1953 observation of a carbon-12 excited state associated with the Hoyle state. The team analyzed alpha particles from a nitrogen-14 reaction with deuterons using magnetic momentum selection, inferring the residual carbon-12 excitation from the spectrum. The paper explicitly acknowledges Fred Hoyle for pointing out the level's astrophysical significance.^[ref]

A physicist who researched spin glasses and became Oxford’s Wykeham Professor of Physics in 1989.^[ref]

An experimental condensed matter physicist researching excitons and their possible Bose-Einstein condensation. His review with G. M. Kavoulakis traces experiments in copper(I) oxide, where early spectroscopic and transport signatures were reinterpreted after Auger recombination became better understood. This history illustrates why an apparent condensation signal must be checked against mechanisms that remove or heat excitons.^[ref]

David Thouless coauthored a theory connecting the Hall conductivity of a two-dimensional electron gas to a topological invariant. In a uniform magnetic field and periodic potential, the Kubo formula can be written so that quantization becomes explicit when the Fermi energy lies in a gap. The integer character of the response explains why continuous changes of microscopic parameters need not continuously change the Hall plateau. A transition between distinct plateaus requires leaving the conditions that protect that quantization.^[ref]

A physicist who researched superfluidity and superconductivity in thin systems.^[ref]

An experimental condensed matter physicist who coauthored an early phase-sensitive test of the pairing state in a cuprate superconductor. Interference in devices joining the cuprate to lead tested a relative phase shift predicted by d-wave superconductivity. The original report discusses device asymmetry and trapped vortices, showing why several observations must be assessed together when inferring the pairing symmetry.^[ref]

A theoretical condensed matter physicist who coauthored a theory of quantum Hall edge states with B. I. Shklovskii and L. I. Glazman. Their electrostatic treatment predicts strip widths and positions, providing a spatial model for how the edge of a confined two-dimensional electron gas carries current.^[ref]

Denis Vion coauthored the quantronium experiment: microwave pulses controlled the quantum state of a superconducting circuit behaving as a two-level system, with separate pulsed readout.^[ref]

Identity source: iramis.cea.fr/en/spec/gq/membres-gq-en/

Dennis Gabor devised holography as a way to record and reconstruct a wavefront. Recording the wave interference between an object field and a known reference field preserves information about relative wave phase in an intensity pattern. Illuminating that pattern with the reference field can reconstruct an image-bearing field. His early motivation was improved electron microscopy; his Nobel lecture explains how later laser sources and tilted-reference arrangements overcame practical limitations of the original in-line geometry.^[ref]

A physicist.^[ref]

Detlef Dürr, Sheldon Goldstein and Nino Zanghì investigated how the usual quantum measurement rules arise in Bohmian mechanics, where a wave function guides a definite particle configuration. Their analysis connects quantum equilibrium, with configuration probability density $\rho =|\psi {|}^2$, to the statistics of apparatus records. In this account, a self-adjoint operator summarizes a class of experimental procedures; its appearance does not require every quantum observable to be an additional pre-existing particle property.^[ref]

Coauthor of work on quantum equilibrium equivariance and Bohmian mechanics.

An experimental particle physicist who participated in the discovery of weak neutral currents. In a neutrino experiment, interactions without an outgoing charged lepton supplied a signature distinct from charged-current events. His participant account explains how event identification and backgrounds had to be controlled before the absence of a visible lepton could support a new interaction mechanism.^[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]