C. I. Westbrook
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View article: Observation of Entanglement in a Cold Atom Analog of Cosmological Preheating
Observation of Entanglement in a Cold Atom Analog of Cosmological Preheating Open
We observe entanglement between collective excitations of a Bose-Einstein condensate in a configuration analogous to particle production during the preheating phase of the early universe. In our setup, the oscillation of the inflaton field…
View article: Parametric pair production of collective excitations in a Bose–Einstein condensate
Parametric pair production of collective excitations in a Bose–Einstein condensate Open
By exciting the transverse breathing mode of an elongated Bose–Einstein condensate, we parametrically produce longitudinal collective excitations in a pairwise manner. This process, also referred to as Faraday wave generation, can be seen …
View article: Silicon nitride based integrated photonic circuit to control a cold-atom source
Silicon nitride based integrated photonic circuit to control a cold-atom source Open
We have developed a silicon nitride based photonic integrated circuit (PIC) that is responsible for the cooling, pumping and imaging of cold rubidium 87 atoms. The photonic integrated circuit consists of two chips placed next to each other…
View article: Parametric pair production of collective excitations in a Bose-Einstein condensate
Parametric pair production of collective excitations in a Bose-Einstein condensate Open
By exciting the transverse breathing mode of an elongated Bose-Einstein condensate, we parametrically produce longitudinal collective excitations in a pairwise manner. This process also referred to as Faraday wave generation, can be seen a…
View article: Quantifying Two-Mode Entanglement of Bosonic Gaussian States from Their Full Counting Statistics
Quantifying Two-Mode Entanglement of Bosonic Gaussian States from Their Full Counting Statistics Open
This repository contains the code which is used to reproduce the figures of the paper "Quantifying two-mode entanglement of bosonic Gaussian states from their full counting statistics".
View article: Epitaxial Stabilization and Emergent Charge Order in Copper Selenide Thin Films
Epitaxial Stabilization and Emergent Charge Order in Copper Selenide Thin Films Open
We demonstrate epitaxial growth of copper selenide (Cu$_{2-x}$Se) thin films in both cubic and rhombohedral phases, achieved via molecular beam epitaxy on Al$_2$O$_3$ (001) substrates. Remarkably, the high-temperature cubic phase -- which …
View article: Coherent coupling of momentum states: Selectivity and phase control
Coherent coupling of momentum states: Selectivity and phase control Open
We demonstrate the effect of pulse shaping in momentum selective atomic Bragg diffraction. We compare temporal square pulses, which produce sidelobes in momentum space, with other shapes which can produce more nearly square momentum distri…
View article: Miniaturized optical system for a chip-based cold-atom inertial sensor
Miniaturized optical system for a chip-based cold-atom inertial sensor Open
We miniaturized the complex optical system responsible for the cooling, pumping, and imaging of an on-chip-based cold-atom inertial sensor. This optical bench uses bonded miniature optics and includes all the necessary optical functions. T…
View article: Noise budget of a trapped on chip cold atom Rubidium 87 clock
Noise budget of a trapped on chip cold atom Rubidium 87 clock Open
In this paper, we present a realisation of an on chip atomic clock using a cold cloud of Rubidium 87 atoms. This clock is based on a Ramsey interferometer with a Ramsey time around 600 ms. This is realized with large lab temperature drift …
View article: Sub-shot-noise interferometry with two-mode quantum states
Sub-shot-noise interferometry with two-mode quantum states Open
We study the feasibility of sub-shot-noise interferometry with imperfect\ndetectors, starting from twin-Fock states and two mode squeezed vacuum states.\nWe derive analytical expressions for the corresponding phase uncertainty. We\nfind th…
View article: Erratum: Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas [Phys. Rev. Lett. <b>117</b>, 235303 (2016)]
Erratum: Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas [Phys. Rev. Lett. <b>117</b>, 235303 (2016)] Open
This corrects the article DOI: 10.1103/PhysRevLett.117.235303.
View article: From point processes to quantum optics and back
From point processes to quantum optics and back Open
Some fifty years ago, in her seminal PhD thesis, Odile Macchi introduced permanental and determinantal point processes. Her initial motivation was to provide models for the set of detection times in fundamental bosonic or fermionic optical…
View article: Observation of $1/k^4$-tails after expansion of Bose-Einstein Condensates with impurities
Observation of $1/k^4$-tails after expansion of Bose-Einstein Condensates with impurities Open
We measure the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities after an expansion in the presence of interactions. We observe tails decaying as $1/k^4$ at large momentum $k$ in the condensate and in the imp…
View article: Effect of trap symmetry and atom-atom interactions on a trapped-atom interferometer with internal state labeling
Effect of trap symmetry and atom-atom interactions on a trapped-atom interferometer with internal state labeling Open
In this paper, we study the dynamics of a trapped atom interferometer with\ninternal state labelling in the presence of interactions. We consider two\nsituations: an atomic clock in which the internal states remain superposed, and\nan iner…
View article: Pair correlation of atoms scattered from colliding Bose-Einstein quasicondensates
Pair correlation of atoms scattered from colliding Bose-Einstein quasicondensates Open
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View article: Thermal counting statistics in an atomic two-mode squeezed vacuum state
Thermal counting statistics in an atomic two-mode squeezed vacuum state Open
We measure the population distribution in one of the atomic twin beams generated by four-wave mixing in an optical lattice. Although the produced two-mode squeezed vacuum state is pure, each individual mode is described as a statistical mi…
View article: Report on 1904.04135v1
Report on 1904.04135v1 Open
We measure the population distribution in one of the atomic twin beams generated by four-wave mixing in an optical lattice.Although the produced two-mode squeezed state is pure, each individual mode is described as a statistical mixture.We…
View article: Report on 1904.04135v1
Report on 1904.04135v1 Open
We measure the population distribution in one of the atomic twin beams generated by four-wave mixing in an optical lattice.Although the produced two-mode squeezed state is pure, each individual mode is described as a statistical mixture.We…
View article: Two-Particle Four-Mode Interferometer for Atoms (poster)
Two-Particle Four-Mode Interferometer for Atoms (poster) Open
International audience
View article: Two-Particle Four-Mode Interferometer for Atoms
Two-Particle Four-Mode Interferometer for Atoms Open
We present a free-space interferometer to observe two-particle interference of a pair of atoms with entangled momenta. The source of atom pairs is a Bose-Einstein condensate subject to a dynamical instability, and the interferometer is rea…
View article: Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas
Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas Open
We report on the single-atom-resolved measurement of the distribution of momenta ℏk in a weakly interacting Bose gas after a 330 ms time of flight. We investigate it for various temperatures and clearly separate two contributions to the de…
View article: Contrast and phase-shift of a trapped atom interferometer using a thermal ensemble with internal state labelling
Contrast and phase-shift of a trapped atom interferometer using a thermal ensemble with internal state labelling Open
We report a theoretical study of a double-well Ramsey interferometer using\ninternal state labelling. We consider the use of a thermal ensemble of cold\natoms rather than a Bose-Einstein condensate to minimize the effects of atomic\nintera…
View article: Momentum-resolved observation of quantum depletion in an interacting Bose gas
Momentum-resolved observation of quantum depletion in an interacting Bose gas Open
We report on the single-atom-resolved measurement of the distribution of momenta $\hbar k$ in a weakly interacting Bose gas after a 330 ms time-of-flight. We investigate it for various temperatures and clearly separate two contributions to…
View article: Quantum Signature of Analog Hawking Radiation in Momentum Space
Quantum Signature of Analog Hawking Radiation in Momentum Space Open
We consider a sonic analog of a black hole realized in the one-dimensional flow of a Bose-Einstein condensate. Our theoretical analysis demonstrates that one- and two-body momentum distributions accessible by present-day experimental techn…
View article: Fast production of Bose-Einstein condensates of metastable helium
Fast production of Bose-Einstein condensates of metastable helium Open
We report on the Bose-Einstein condensation of metastable Helium-4 atoms\nusing a hybrid approach, consisting of a magnetic quadrupole and a crossed\noptical dipole trap. In our setup we cross the phase transition with 2x10^6\natoms, and w…
View article: Microwave-stimulated Raman adiabatic passage in a Bose-Einstein condensate on an atom chip
Microwave-stimulated Raman adiabatic passage in a Bose-Einstein condensate on an atom chip Open
We report the achievement of stimulated Raman adiabatic passage (STIRAP) in\nthe microwave frequency range between internal states of a Bose-Einstein\ncondensate (BEC) magnetically trapped in the vicinity of an atom chip. The\nSTIRAP proto…
View article: Symmetric microwave potentials for interferometry with thermal atoms on a chip
Symmetric microwave potentials for interferometry with thermal atoms on a chip Open
A trapped atom interferometer involving state-selective adiabatic potentials\nwith two microwave frequencies on a chip is proposed. We show that this\nconfiguration provides a way to achieve a high degree of symmetry between the\ntwo arms …