Quantum control of multilevel atoms with rotational degeneracy using short laser pulses

Demeter, G.

doi:10.1103/physreva.82.043404

Cited by 3 publications

(6 citation statements)

References 29 publications

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“…These dark states are formed from a coherent superposition of ground states due to quantum interference effects [160,161]. Examples of coherent processes include coherent population trapping [162], large-area pulses [21, section 3.2], adiabatic passage [21, section 3.8] [163], and stimulated Raman adiabatic passage (STIRAP) [164]. STIRAP is a highly efficient and robust process which utilizes a stimulated two-photon transition between a pair of metastable states, mediated by a third state.…”

Section: Applicationsmentioning

confidence: 99%

Light propagation through atomic vapours

Siddons¹

2014

J. Phys. B: At. Mol. Opt. Phys.

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This tutorial presents the theory necessary to model the propagation of light through an atomic vapour. The history of atom–light interaction theories is reviewed, and examples of resulting applications are provided. A numerical model is developed and results presented. Analytic solutions to the theory are found, based on approximations to the numerical work. These solutions are found to be in excellent agreement with experimental measurements.

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Section: Applicationsmentioning

confidence: 99%

Light propagation through atomic vapours

Siddons¹

2014

J. Phys. B: At. Mol. Opt. Phys.

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“…The preparation of atomic coherence continues to draw a lot of attention [4][5][6], with potential applications in quantum computation and quantum information protocols [7]. The control of quantum states required in quantum logic operations is often achieved via the application of optical fields to atomic systems, for example, in the implementation of qubit rotations for logic gates [8].…”

mentioning

confidence: 99%

“…Controlling the absorptive and dispersive properties of high density alkali metal vapours has allowed the realisation of storage of light [1], quantum memory [2] and entanglement of macroscopic systems [3]. The preparation of atomic coherence continues to draw a lot of attention [4][5][6], with potential applications in quantum computation and quantum information protocols [7]. The control of quantum states required in quantum logic operations is often achieved via the application of optical fields to atomic systems, for example, in the implementation of qubit rotations for logic gates [8].…”

mentioning

confidence: 99%

“…The preparation of atomic coherence continues to draw a lot of attention [1][2][3], with potential applications in quantum computation and quantum information protocols [4]. Quantum memory [5] and entanglement of macroscopic systems [6], both of which are essential for large-scale quantum computers, have been achieved in high-density alkali metal vapours.…”

mentioning

confidence: 99%

“…The ground-intermediate state coupling is via the pump electric field E P , with associated slowly varying 1 envelope ẼP = Ẽ+ + + Ẽ− − . Here we have written the polarization state in the helical basis2 , where the…”

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confidence: 99%

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Optical preparation and measurement of atomic coherence at gigahertz bandwidth

Siddons¹,

Adams²,

Hughes³

2012

J. Phys. B: At. Mol. Opt. Phys.

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We detail a method for the preparation of atomic coherence in a high density atomic medium, utilising a coherent preparation scheme of gigahertz bandwidth pulses. A numerical simulation of the preparation scheme is developed, and its efficiency in preparing coherent states is found to be close to unity at the entrance to the medium. The coherence is then measured non-invasively with a probe field.Controlling the absorptive and dispersive properties of high density alkali metal vapours has allowed the realisation of storage of light [1], quantum memory [2] and entanglement of macroscopic systems [3]. The preparation of atomic coherence continues to draw a lot of attention [4][5][6], with potential applications in quantum computation and quantum information protocols [7]. The control of quantum states required in quantum logic operations is often achieved via the application of optical fields to atomic systems, for example, in the implementation of qubit rotations for logic gates [8]. In this instance the qubit takes the form of an atomic coherence state, but usage of single photons as 'flying qubits' is also an area of great interest since transmitting information via light is common place in telecommunications [9]. Often both atomic and photonic qubits are utilised and hence the requirement of reliable transfer of quantum states between photons and atoms, which is the principle behind optical quantum memory [10,11]. The phenomenon of photon echoes [12,13] has been used to store and retrieve arbitrary single-photon wave packets [14] along with the related gradient echo memory [15,16]. The storage and retrieval of photons at high speeds (gigahertz bandwidth) for optical quantum memory [17,18] is advantageous for quantum computation, which calls for high-rate operations such as fast quantum gates based on Rydberg atoms [19,20].Most quantum computation schemes require a few working states amongst which interactions are mediated via optical control fields, and typically require the system to be prepared initially in a pure state. Preparation schemes based on spontaneous emission, such as Coherent population trapping (CPT) [21], take many excited state lifetimes for a medium to reach its final state, which substantially limits the bandwidth of the operation. Also, they begin to fail at increasingly high density, as photons scatter from the pumping field and continue to interact with the sample [22]. For these reasons, transfer via an off-resonant coherent mechanism is preferred, in which there is a certain amount of freedom to choose the final atomic state of the atom, and can be completed over timescales faster than those necessary for incoherent pumping. Stimulated Raman adiabatic passage (STI-RAP) is one such technique for the highly efficient transfer of population between two non-degenerate metastable states, facilitated via a stimulated two-photon transition involving an unstable intermediate state [23]. The technique has been further expanded with the generalisation of the three levels into degenerate manifolds...

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Coherent manipulation of trapped Rb atoms by overlapping frequency-chirped laser pulses: theory and experiment

et al. 2022

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We present results of experimental and theoretical studies of coherent momentum transfer to rubidium atoms in a magneto-optical trap by pairs of counter-propagating frequency-modulated (chirped) laser pulses. The counter-propagating pulse pairs partially overlap each other leading to multiphoton interaction processes. We show experimentally that the mechanical momentum transferred to atoms in this scheme of interaction is larger than in the case of non-overlapping pulse pairs acting separately on the atoms. Results of numerical simulations that take into account all relevant hyperfine energy states of Rb along with the influence of relaxation and re-pumping processes are in good agreement with obtained experimental results. Graphical abstract

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Quantum control of multilevel atoms with rotational degeneracy using short laser pulses

Cited by 3 publications

References 29 publications

Light propagation through atomic vapours

Light propagation through atomic vapours

Optical preparation and measurement of atomic coherence at gigahertz bandwidth

Coherent manipulation of trapped Rb atoms by overlapping frequency-chirped laser pulses: theory and experiment

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