Composite pulses for interferometry in a thermal cold atom cloud

Dunning, Alexander; Gregory, Rachel; Bateman, James; Cooper, Nathan; Himsworth, Matthew; Jones, Jonathan A.; Freegarde, Tim

doi:10.1103/physreva.90.033608

Cited by 65 publications

(67 citation statements)

References 56 publications

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“…Additionally, the increased Raman power enables one to reduce Rabifrequency inhomogeneity by increasing Raman beam waist, further improving pulse efficiency. Pulse efficiency can also be improved by using composite pulses [5,19,20].…”

Section: Interferometermentioning

confidence: 99%

Dual-Axis High-Data-Rate Atom Interferometer via Cold Ensemble Exchange

2014

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We demonstrate a dual-axis accelerometer and gyroscope atom interferometer, which can form the building blocks of a six-axis inertial measurement unit. By recapturing the atoms after the interferometer sequence, we maintain a large atom number at high data rates of 50 to 100 measurements per second. Two cold ensembles are formed in trap zones located a few centimeters apart and are launched toward one another. During their ballistic trajectory, they are interrogated with a stimulated Raman sequence, detected, and recaptured in the opposing trap zone. We achieve sensitivities at μg= ffiffiffiffiffiffi Hz p and ðμrad=sÞ= ffiffiffiffiffiffi Hz p levels, making this a compelling prospect for expanding the use of atom interferometer inertial sensors beyond benign laboratory environments.

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Section: Interferometermentioning

confidence: 99%

Dual-Axis High-Data-Rate Atom Interferometer via Cold Ensemble Exchange

2014

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“…In addition to the rectangular and Gaussian pulses, we discuss two other representative pulse shapes: (i) the GSinc pulse, which is the product of a Gaussian and a cardinal sine, and (ii) the Gaussian-Flat pulse (labeled GFlat thereafter) which is a flat pulse with Gaussian edges. For completeness of the presentation, we study in section 4 the influence of pulse shaping on the frequency selectivity, in line with previous works [26,27]. Finally, we present in section 5 a correction to the interferometer scale factor associated with pulse shaping, and discuss its relevance for different precision measurements involving AI based sensors.…”

Section: Introductionmentioning

confidence: 76%

“…Efficient transitions (i.e. high contrasts) can thus be achieved by temporally shaping the pulse intensity and phase, as shown in [26,27]. Moreover, when driving an interferometer with large momentum transfer (LMT) atom optics, it has been shown that pulses of Gaussian temporal shape significantly improve the transfer efficiency with respect to rectangular pulse shapes [28,29].…”

Section: Introductionmentioning

confidence: 99%

Improving the phase response of an atom interferometer by means of temporal pulse shaping

et al. 2018

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We study theoretically and experimentally the influence of temporally shaping the light pulses in an atom interferometer, with a focus on the phase response of the interferometer. We show that smooth light pulse shapes allow rejecting high frequency phase fluctuations (above the Rabi frequency) and thus relax the requirements on the phase noise or frequency noise of the interrogation lasers driving the interferometer. The light pulse shape is also shown to modify the scale factor of the interferometer, which has to be taken into account in the evaluation of its accuracy budget. We discuss the trade-offs to operate when choosing a particular pulse shape, by taking into account phase noise rejection, velocity selectivity, and applicability to large momentum transfer atom interferometry.

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“…We have explored the performance of several established NMR pulse sequences when applied to velocitysensitive Raman state manipulation in a freely expanding cold atom cloud, allowing the inversion infidelity to be halved [16]. The agreement between experimental measurements and simple predictions shows the underlying coherence of the atomic ensemble.…”

Section: Composite Pulse Techniques For Fidelity Enhancementmentioning

confidence: 99%

Velocimetry, Cooling and Rotation Sensing by Cold-Atom Matterwave Interferometry

Carey

Elcock

Saywell

et al. 2017

Quantum Information and Measurement (QIM) 2017

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Interferometric measurement of an atom's velocity allows, by tailoring the impulse imparted by the matterwave-splitting laser pulses, a velocity-dependent force that cools an atomic sample. Differential measurement reveals the sample's acceleration and rotation.OCIS codes: (020.1335) Atom optics; (020.3320) Laser cooling; (120.5790) Sagnac effect; (120.7250) Velocimetry Interferometric velocimetryRaman matterwave interferometry [1] commonly uses pairs of laser beams, similar in frequency but opposite in wavevector, to couple atomic states of similar electronic configuration and energy but different linear momentum. The momentum difference gives the radiative interaction a velocity-dependence, which may be overcome if the interaction is limited to pulses short enough to be broad in bandwidth, but which persists between pulses in the phase drift between the atomic superposition and the laser oscillator. The small frequency difference between the coupled states means that there is negligible spontaneous emission, and that the beam pair can be produced with phase precision by radio-frequency modulation of a single master laser. With these ingredients, atom interferometry has been shown to be a precise means of inertial measurement [2][3][4].The evolution of the wavefunction of an atom, as it moves with respect to, but between the pulses of, an interacting optical field, may be viewed from two perspectives. From that of the optical apparatus, the coupled atomic states differ in kinetic energy, and the phase of their superposition therefore accrues because of the difference in classical action between their trajectories. Viewed from the inertial frame of the atom, the phase of the optical field varies as the apparatus moves and presents different points for the stationary atom to sample. The result is a relative phase φ between the atomic superposition and the optical field which, if the field is resonant for a stationary atom, depends after a time t upon the atom's velocity v:where k eff is the effective wavevector of the Raman field, equal to the wavevector difference between its components, and v R is the recoil velocity ℏk eff /m for atoms of mass m.Whether regarded as interference of the de Broglie matterwave, or of the optical wave transferred via an atomic resonator, the interference fringes of a two-pulse Ramsey interferometer show a sinusoidal dependence of the transferred population upon time, with a periodicity determined by the velocity component along k eff . Single velocity components may be found from the fringes' periodicity, and distributions from their Fourier transform. Interferometric coolingInterferometric measurement of the atomic velocity is accompanied by a radiative impulse, for atoms receive an impulse of ℏk eff when they are transferred between the two interferometer states. By tailoring the interferometer period and introducing an adjustable phase between the two interferometer pulses, it may be arranged that this impulse on average opposes the atom's velocity, and an atomic sampl...

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Composite pulses for interferometry in a thermal cold atom cloud

Cited by 65 publications

References 56 publications

Dual-Axis High-Data-Rate Atom Interferometer via Cold Ensemble Exchange

Dual-Axis High-Data-Rate Atom Interferometer via Cold Ensemble Exchange

Improving the phase response of an atom interferometer by means of temporal pulse shaping

Velocimetry, Cooling and Rotation Sensing by Cold-Atom Matterwave Interferometry

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