Impact of direct-digital-synthesizer finite resolution on atom gravimeters

Karcher, Romain; Santos, F. Pereira Dos; Merlet, Sébastien

doi:10.1103/physreva.101.043622

Cited by 9 publications

(5 citation statements)

References 22 publications

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“…Consequently, third-order diffraction might be an interesting tool for the diffraction of wave packets with a narrow momentum distribution like BECs, since it allows one to reduce the complexity of the experiment. In general, each transition of a sequence might introduce spurious phase contributions [45], and using fewer pulses may facilitate the suppression of some uncertainties connected to frequency chirps [46][47][48]. Furthermore, the overall duration of a single pulse can become shorter than that of a corresponding sequence of pulses, which might be particularly appealing for very compact setups [49] intended for real-world applications [50].…”

Section: B Comparison To First-order and Sequential Pulsesmentioning

confidence: 99%

Atomic Raman scattering: Third-order diffraction in a double geometry

et al. 2020

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In a retroreflective scheme with an atom initially at rest, atomic Raman diffraction adopts some of the properties of Bragg diffraction due to additional couplings to off-resonant momenta. As a consequence, double Raman diffraction has to be performed in a Bragg-type regime, where the pulse duration is sufficiently long to suppress diffraction into spurious orders. Taking advantage of this regime, double Raman allows for resonant higher-order diffraction. We study theoretically the case of third-order diffraction and compare it to first order as well as a sequence of first-order Raman pulses giving rise to the same momentum transfer as the third-order pulse. Moreover, we demonstrate that interferometry is possible, and we investigate amplitude and contrast of a third-order double Raman Mach-Zehnder interferometer. In fact, third-order diffraction constitutes a competitive tool for the diffraction of ultracold atoms and interferometry based on large momentum transfer since it allows one to reduce the complexity of the experiment as well as the total duration of the diffraction process compared to a sequence, at the cost of higher pulse intensities.

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Section: B Comparison To First-order and Sequential Pulsesmentioning

confidence: 99%

Atomic Raman scattering: Third-order diffraction in a double geometry

et al. 2020

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“…In this work, the Raman lasers frequency difference is driven by two separate frequency synthesizers, namely a synthesizer (NI, QuickSyn Lite Synthesizer) driving the high frequency side of the Raman lasers (ω 1 , 6.58 GHz) and a direct digital synthesizer (DDS, AD9854) driving the low frequency side of the Raman lasers (ω 2 , 123 MHz), see Figure 3. The frequency chirping is provided by AD9854 via a double-pass AOM during the interferometry sequence, ensuring deterministic frequency shifting and micro-second time steps 23 . The intensity ratio between the Raman lasers is easily adjusted via the halfwave plate and polarization beamsplitter pair (which overlaps the two laser beams) in order to minimise the AC Stark shift of the laser transitions 24 .…”

Section: Frequency Control a Eom Modulementioning

confidence: 99%

Compact single-seed, module-based laser system on a transportable high-precision atomic gravimeter

En¹,

Dumke²

2022

Preprint

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A single-seed, module-based compact laser system is demonstrated on a transportable 87 Rb-based highprecision atomic gravimeter. All the required laser frequencies for the atom interferometry are provided by free-space acousto-optic modulators (AOM) and resonant electro-optic phase modulators (EOM). The optical phase-locked loop between two optical paths derived from the same laser provides an easy frequency manipulation between two laser frequencies separated by hyperfine frequency of 6.835 GHz using AOM and EOM respectively. The optical phase-locked loop also provides a convenient way for vibration compensation through the Raman lasers' phase offset. Furthermore, the modular design approach allows plug-and-play nature on each individual optic module and also increases the mechanical stability of the optical systems. We demonstrate high-precision gravity measurements with 17.8 µGal stability over 250 seconds averaging time and 2.5 µGal stability over 2 hours averaging time.

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“…In this context, we study an asymmetric Ramsey-Bordé (RB) configuration used to determine the fine structure constant for fundamental test in QED [19,46] and Mach-Zehnder (MZ) and Butterfly (BU) interferometers for acceleration and rotation measurement [14,86,[91][92][93][94][95][96][97][98][99][100][101][102][103]. We apply composite pulse protocols to realize a generalized hyper-Ramsey-Bordé (GHRB) interferometer reducing or eliminating residual corrections from light-shift and sensitivity to residual transverse Dopplershifts.…”

Section: Hyper-interferometersmentioning

confidence: 99%

“…The laser frequency is linearly scanned during the three-pulse interferometer for four different free evolutions times. When the laser frequency chirp becomes equal the local acceleration, the free fall inducing a Doppler-shift is canceled and interferences become independent to a modification of the free evolution time [92,97,100,102].…”

Section: Mz and Bu Interferencesmentioning

confidence: 99%

Generalized hyper-Ramsey-Bordé matter-wave interferometry: quantum engineering of robust atomic sensors with composite pulses

Zanon-Willette,

Wilkowski,

Lefevre

et al. 2022

Preprint

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A new class of atomic interferences using ultra-narrow optical transitions are pushing quantum engineering control to a very high level of precision for a next generation of sensors and quantum gate operations. In such context, we propose a new quantum engineering approach to Ramsey-Bordé interferometry introducing multiple composite laser pulses with tailored pulse duration, Rabi field amplitude, frequency detuning and laser phase-step. We explore quantum metrology with hyper-Ramsey and hyper-Hahn-Ramsey clocks below the 10 −18 level of fractional accuracy by a fine tuning control of light excitation parameters leading to spinor interferences protected against light-shift coupled to laser-probe field variation. We review cooperative composite pulse protocols to generate robust Ramsey-Bordé, Mach-Zehnder and double-loop atomic sensors shielded against measurement distortion related to Doppler-shifts and light-shifts coupled to pulse area errors. Fault-tolerant autobalanced hyper-interferometers are introduced eliminating several technical laser pulse defects that can occur during the entire probing interrogation protocol. Quantum sensors with composite pulses and ultra-cold atomic sources should offer a new level of high accuracy in detection of acceleration and rotation inducing phase-shifts, a strong improvement in tests of fundamental physics with hyper-clocks while paving the way to a new conception of atomic interferometers tracking spacetime gravitational waves with a very high sensitivity.

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Impact of direct-digital-synthesizer finite resolution on atom gravimeters

Cited by 9 publications

References 22 publications

Atomic Raman scattering: Third-order diffraction in a double geometry

Atomic Raman scattering: Third-order diffraction in a double geometry

Compact single-seed, module-based laser system on a transportable high-precision atomic gravimeter

Generalized hyper-Ramsey-Bordé matter-wave interferometry: quantum engineering of robust atomic sensors with composite pulses

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