Browsing by Author "Mitchell, Morgan W."
Now showing items 1-17 of 17
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Autoheterodyne characterization of narrow-band photon pairs
(American Institute of Physics (AIP), 2021-07-19)
Article
Open AccessWe describe a technique to measure photon pair joint spectra by detecting the time-correlation beat note when nondegenerate photon pairs interfere at a beam splitter. The technique implements a temporal analog of the ... -
Bose-Einstein condensate comagnetometer
(American Institute of Physics (AIP), 2020-04-29)
Article
Open AccessWe describe a comagnetometer employing the f ¼ 1 and f ¼ 2 ground state hyperfine manifolds of a 87Rb spinor Bose-Einstein condensate as colocated magnetometers. The hyperfine manifolds feature nearly opposite gyromagnetic ... -
Cavity-enhanced polarization rotation measurements for low-disturbance probing of atoms
(2021-12-06)
Article
Open AccessWe propose and demonstrate cavity-enhanced polarization-rotation measurement as a means to detect magnetic effects in transparent media with greater sensitivity at equal optical disturbance to the medium. Using the Jones ... -
Fast optical source for quantum key distribution based on semiconductor optical amplifiers
(2011)
Article
Open AccessA novel integrated optical source capable of emitting faint pulses with different polarization states and with different intensity levels at 100 MHz has been developed. The source relies on a single laser diode followed ... -
Interferometric measurement of interhyperfine scattering lengths in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Rb</mml:mi><mml:mprescripts /><mml:none /><mml:mn>87</mml:mn></mml:mmultiscripts></mml:math>
(American Physical Society (APS), 2019-09-10)
Article
Open AccessWe present interferometeric measurements of the f = 1 to f = 2 interhyperfine scattering lengths in a single-domain spinor Bose-Einstein condensate of 87Rb. The interhyperfine interaction leads to a strong and state-dependent ... -
Long-term laser frequency stabilization using fiber interferometers
(AIP, 2015-07-09)
Article
Open AccessWe report long-term laser frequency stabilization using only the target laser and a pair of 5 m fiber interferometers, one as a frequency reference and the second as a sensitive thermometer to stabilize the frequency ... -
Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres
(Nature Publishing Group, 2015-10-21)
Article
Restricted access - publisher's policyMore than 50 years ago1, John Bell proved that no theory of nature that obeys locality and realism2 can reproduce all the predictions of quantum theory: in any local-realist theory, the correlations between outcomes of ... -
Macroscopic Quantum State Analyzed Particle by Particle
(ACS Publications, 2015-03-27)
Article
Open AccessMacroscopic quantum phenomena, e.g., superconductivity and squeezing, are believed to result from entanglement of macroscopic numbers of particles. We report the first direct study of this kind of entanglement: we use ... -
Manipulating and measuring single atoms in the Maltese cross geometry
(2021-09-06)
Article
Open AccessBackground: Optical microtraps at the focus of high numerical aperture (high-NA) imaging systems enable efficient collection, trapping, detection and manipulation of individual neutral atoms for quantum technology and ... -
Passive Decoy-State Quantum Key Distribution with Coherent Light
(MDPI, 2015-06-12)
Article
Open AccessSignal state preparation in quantum key distribution schemes can be realized using either an active or a passive source. Passive sources might be valuable in some scenarios; for instance, in those experimental setups ... -
Passive decoy-state quantum key distribution with coherent light
(2015-06-12)
Article
Open AccessSignal state preparation in quantum key distribution schemes can be realized using either an active or a passive source. Passive sources might be valuable in some scenarios; for instance, in those experimental setups ... -
Phase-stable source of polarization-entangled photons in a linear double-pass configuration
(2013-05)
Article
Open AccessWe demonstrate a compact, robust, and highly efficient source of polarization-entangled photons, based on linear bi-directional down-conversion in a novel ‘folded sandwich’ configuration. Bi-directionally pumping a single ... -
Quantum atom-light interfaces in the Gaussian description for spin-1 systems
(2013-10)
Article
Open AccessWe extend the covariance matrix description of atom–light quantum interfaces, originally developed for real and effective spin-1/2 atoms, to include ‘spin alignment’ degrees of freedom. This allows accurate modelling ... -
Signal tracking beyond the time resolution of an atomic sensor by Kalman filtering
(American Institute of Physics (AIP), 2018-01-26)
Article
Open AccessWe study causal waveform estimation (tracking) of time-varying signals in a paradigmatic atomic sensor, an alkali vapor monitored by Faraday rotation probing. We use Kalman filtering, which optimally tracks known linear ... -
Single-domain Bose condensate magnetometer achieves energy resolution per bandwidth below h
(2022-02-08)
Article
Open AccessWe present a magnetic sensor with energy resolution per bandwidth ER < h. We show how a 87Rb single-domain spinor Bose– Einstein condensate, detected by nondestructive Faraday rotation probing, achieves single-shot ... -
Strong experimental guarantees in ultrafast quantum random number generation
(American Physical Society, 2015-01-12)
Article
Open AccessWe describe a methodology and standard of proof for experimental claims of quantum random-number generation (QRNG), analogous to well-established methods from precision measurement. For appropriately constructed physical ... -
Ultra-fast quantum randomness generation by accelerated phase diffusion in a pulsed laser diode
(2014-01-27)
Article
Open AccessWe demonstrate a high bit-rate quantum random number generator by interferometric detection of phase diffusion in a gain-switched DFB laser diode. Gain switching at few-GHz frequencies produces a train of bright pulses ...
