Robust Ramsey sequences with Raman adiabatic rapid passage

Kotru, Krish; Brown, Justin M.; Butts, David L.; Kinast, J.; Stoner, R. E.

doi:10.1103/physreva.90.053611

Cited by 11 publications

(9 citation statements)

References 27 publications

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“…This work provides a method to investigate the competition effect caused by the low population transfer efficiency in stimulated Raman tran-sitions. The phase competition can be suppressed by choosing the interrogation time and the parameters of Raman lasers, or may be avoided by improving the population transfer efficiency with stimulated Raman adiabatic techniques [40,41].…”

Section: Discussionmentioning

confidence: 99%

Competition effects of multiple quantum paths in an atom interferometer

Yao

et al. 2018

Optics Communications

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We present an observation of competition effect among multiple quantum paths in a Raman-type Mach-Zehnder atom interferometer. By measuring the contrast of interference fringes, the competition effect among multiple interference paths is experimentally investigated. Due to the phase competition, the contrast periodically oscillates when modulating either the phase or the interrogation time between Raman pulses. The multiple quantum paths form because of the imperfect population transfer efficiency in stimulated Raman transitions, and are verified by modulating the duration of Raman pulses. The contrast could be optimized by suppressing the phase competition.

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Section: Discussionmentioning

confidence: 99%

Competition effects of multiple quantum paths in an atom interferometer

Yao

et al. 2018

Optics Communications

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“…1a. ARP has been proven to be very useful in preparing quantum states in the presence of small magnetic field fluctuations, as it is relatively insensitive to jitter in the transition frequency [4]. ARP thus relaxes demands on the accuracy of the frequency of the radiation field or, equivalently, accurate knowledge of the transition frequency of the two-level system.…”

Section: Introductionmentioning

confidence: 99%

Deterministic quantum state transfer of atoms in a random magnetic field

et al. 2019

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We propose a method for transferring atoms to a target quantum state for a multilevel quantum system with sequentially increasing, but otherwise unknown, energy splitting. This is achieved with a feedback algorithm that processes off-resonant optical measurements of state populations during adiabatic rapid passage in real-time. Specifically, we reliably perform the transfer |F = 2, mF = 2 → |1, 1 → |2, 1 for a sample of ultracold 87 Rb in the presence of a random external magnetic field. arXiv:1810.04921v2 [quant-ph]

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“…The transition is produced by counterpropagating optical frequencies ω 1 and ω 2 , with two-photon detuning δ and one-photon detuning Δ, defined with respect to an excited state jii. To improve the atomic coherence during LMT, we use augmentation pulses based on frequency-swept ARP with Raman transitions [24]. In direct analogy to ARP methods from nuclear magnetic resonance, Raman ARP in an effective two-level system inverts the population with high fidelity by slowly sweeping the Raman detuning δ through resonance [25,26].…”

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confidence: 99%

“…To reduce spontaneous emission during LMT, we used the relatively short tan/tanh ARP pulse [24,[28][29][30]. The time-dependent ARP detuning was δðtÞ ¼ Ω ARP tan ½αð2t=T π − 1Þ, where t ∈ f0; T π g, T π sets the total sweep duration, Ω ARP alters the sweep rate, and α ¼ arctanðδ max =Ω ARP Þ, with δ max being the maximum detuning.…”

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confidence: 99%

Large-Area Atom Interferometry with Frequency-Swept Raman Adiabatic Passage

et al. 2015

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We demonstrate light-pulse atom interferometry with large-momentum-transfer atom optics based on stimulated Raman transitions and frequency-swept adiabatic rapid passage. Our atom optics have produced momentum splittings of up to 30 photon recoil momenta in an acceleration-sensitive interferometer for laser cooled atoms. We experimentally verify the enhancement of phase shift per unit acceleration and characterize interferometer contrast loss. By forgoing evaporative cooling and velocity selection, this method lowers the atom shot-noise-limited measurement uncertainty and enables large-area atom interferometry at higher data rates. DOI: 10.1103/PhysRevLett.115.103001 PACS numbers: 37.25.+k, 03.75.Be, 03.75.Dg Light-pulse atom interferometry (LPAI) is a preeminent method for precision measurements of inertial forces [1,2] and fundamental physical constants [3,4]. Highly sensitive LPAI systems may be an enabling technology for nextgeneration inertial navigators [5][6][7], gravitational wave detectors [8], and tests of the equivalence principle [9]. Nevertheless, many light-pulse atom interferometers are presently limited by atom beam splitters and mirrors that create small momentum separations (two photon recoil momenta) between diffracting wave packets. The sensitivity of these interferometers typically increases with the effective area enclosed by the interfering wave packets [10]. Since this area is proportional to momentum separation, sensitivity can be enhanced using atom optics that generate large momentum transfer (LMT). Previous demonstrations of atom interferometry with LMT atom optics have taken several approaches, including sequential application of stimulated Raman transitions [11,12], Raman composite pulses [13], and stimulated Raman adiabatic rapid passage (STIRAP) pulses [14], as well as application of multiphoton-Bragg transitions [15][16][17], and Bloch oscillations in an optical lattice [18,19].In most of these demonstrations, cold atoms from a magneto-optical trap (MOT) were either evaporatively cooled or velocity selected-both of which typically discard >90% of the original atom sample. A reduced atom number is detrimental to atom shot-noise-limited measurement uncertainty and to operation at fast data rates. A slower data rate results because, following every measurement cycle, the steady-state atom number in the MOT must be recovered primarily from roomtemperature atoms. When cold atoms are recaptured, however, fewer atoms must be loaded from the roomtemperature background vapor, thus allowing the data rate to be increased above 100 Hz [20]. High data rates are crucial for atom interferometric measurements of dynamic signals, such as rapidly varying accelerations and rotations of moving platforms, as well as strains from high frequency (∼10 Hz) gravitational waves [8,19]. The fastest data rates with evaporative cooling have been limited to ≤1.3 Hz [21]; velocity selection at high data rates requires the added complexity of a 2D MOT to maintain atom number [22].In this Letter, we demonstra...

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Robust Ramsey sequences with Raman adiabatic rapid passage

Cited by 11 publications

References 27 publications

Competition effects of multiple quantum paths in an atom interferometer

Competition effects of multiple quantum paths in an atom interferometer

Deterministic quantum state transfer of atoms in a random magnetic field

Large-Area Atom Interferometry with Frequency-Swept Raman Adiabatic Passage

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