Deterministic Delivery of a Single Atom

Kuhr, Stefan; Alt, Wolfgang; Schrader, D.; Müller, Martin; Gomer, V.; Meschede, Dieter

doi:10.1126/science.1062725

Cited by 250 publications

(187 citation statements)

References 28 publications

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“…The cavity-enhanced dipole force has already been applied to studies of cavity quantum electrodynamics [17,18,24] and quantum computing [7,25]. Dissipative interaction with the cavity field has also been proposed as a mechanism for cooling the confined sample [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Cavity-enhanced toroidal dipole force traps for dark-field seeking species

Freegarde

Dholakia

2002

Optics Communications

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Dipole force traps for dark-field seeking states of atoms and molecules require regions of low intensity that are completely surrounded by a brighter optical field. Confocal cavities allow the resonant enhancement of these interesting transverse mode superpositions, and put deep far-off-resonance traps within reach of low-power diode lasers. In this paper, we show how an array of dark-field rings may be created simply using a single Gaussian beam. Such a geometry lends itself to the study of toroidal Bose-Einstein condensates. Ó

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Section: Introductionmentioning

confidence: 99%

“…Despite some residual scattering, such schemes have been used to produce an atomic Bose-Einstein condensate (BEC) [6], to allow the controlled delivery of single atoms [7], and to trap caesium dimers [8].…”

Section: Introductionmentioning

confidence: 99%

Cavity-enhanced toroidal dipole force traps for dark-field seeking species

Freegarde

Dholakia

2002

Optics Communications

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“…Combining fixed frequency microwave pulses with our "optical conveyor belt" technique [9,10] inside a magnetic field gradient, we furthermore realize APs by transporting atoms across the position of resonance. In this experiment, the atom-field coupling and the position dependence of the transition frequency are chosen such that the dynamics of the system is similar to that of atoms coupled to the mode of an optical high finesse FabryPerot resonator [11].…”

mentioning

confidence: 99%

“…We now examine the possibility of inducing adiabatic spin flips with a fixed microwave frequency by transporting the atoms across the position of resonance with our optical conveyor belt technique [9,10]. This option is particularly interesting for quantum information processing schemes in neutral atom cavity QED, see e. g. [17].…”

mentioning

confidence: 99%

“…Whereas the APD signal allows us to monitor the number of atoms, the ICCD provides us with information about their positions [12]. The atoms are transferred from the MOT to a standing wave dipole trap [9,10], generated by two counter-propagating far red-detuned laser beams with a wavelength of λ = 1064 nm. They interfere and produce a chain of potential wells of typically 1 mK depth.…”

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Adiabatic quantum state manipulation of single trapped atoms

et al. 2005

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We use microwave induced adiabatic passages for selective spin flips within a string of optically trapped individual neutral Cs atoms. We position-dependently shift the atomic transition frequency with a magnetic field gradient. To flip the spin of a selected atom, we optically measure its position and sweep the microwave frequency across its respective resonance frequency. We analyze the addressing resolution and the experimental robustness of this scheme. Furthermore, we show that adiabatic spin flips can also be induced with a fixed microwave frequency by deterministically transporting the atoms across the position of resonance.PACS numbers: 03.67.Lx, 39.25.+k, 32.80.Qk Adiabatic passages (APs) [1] are an interesting alternative to purely resonant interaction for controlling the quantum state of atoms. They rely on the fact that the coupled atom-field system remains in its instantaneous eigenstate if the variation of its parameters (atomfield detuning and field strength) is sufficiently slow and smooth. One can thus adiabatically transfer a system from an initial to a final state and, under certain conditions, fluctuations of the parameters will not affect the outcome of the AP. The pioneering works concerning APs were performed in nuclear magnetism to achieve inversion of a spin system [2]. The first application of this method in the optical domain was realized in [3] to invert the population in NH 3 molecules. Ever since, a multitude of different AP techniques have been proposed and successfully realized [4]. It has also been shown that APs can be used to robustly prepare superpositions of energy eigenstates [5]. Furthermore, it was proposed to prepare entanglement and implement quantum logic operations through adiabatic processes [6,7].We have recently demonstrated that a string of neutral Cs atoms stored in a standing wave optical dipole trap can be used to realize a quantum register [8]. There, quantum information was written into the two Cs hyperfine ground states by subjecting selected atoms to resonant microwave pulses. Here, we report on the realization of an adiabatic method for flipping the states of individual atoms out of a string. As in [8], the atoms are discriminated through a position dependent transition frequency. The APs are accomplished by sweeping the microwave frequency across the resonance frequency of the respective atom. We investigate the performance of our method by recording AP spectra of few as well as of single atoms, yielding high-quality data in perfect agreement with theory. The spatial discrimination of this scheme is comparable to resonant addressing. At the same time, the method is much more robust than in the resonant case. It is therefore a useful tool for the manipulation and control of our quantum register.Combining fixed frequency microwave pulses with our "optical conveyor belt" technique [9, 10] inside a magnetic field gradient, we furthermore realize APs by transporting atoms across the position of resonance. In this experiment, the atom-field coupling and the ...

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The Deterministic Generation of Photons by Cavity Quantum Electrodynamics

Walther

2007

Elements of Quantum Information

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Cavity quantum electrodynamics allows the study of strong coupling between excited atoms and a single mode of a resonant cavity. As a consequence of the strong coupling the cavity field and the atom are entangled. The system thus provides important ingredients necessary for studies of quantum information processing. In addition the periodic exchange of a photon between atom and cavity can be studied. It thus represents the ideal system to investigate the Jaynes-Cummings model and to study a variety of phenomena related to the dynamics of the photon exchange such as collapse and revivals depending on the statistics of the photon field. Furthermore, it is an ideal system to study the quantum measurement process. The system leads to masers and lasers which sustain oscillations with less than one atom on average in the cavity and can, in addition, be used as a deterministic photon source. The setup allows to study in detail the conditions necessary to obtain nonclassical radiation, i.e. radiation with sub-Poissonian photon statistics and even photon number states; this is the case even when Poissonian pumping is used. This paper reviews the work on cavity quantum electrodynamics performed with the one-atom maser and with a single ion trap laser. We will start with the discussion of the one-atom maser. For a more detailed discussion of those experiments see also [1].

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Deterministic Delivery of a Single Atom

Cited by 250 publications

References 28 publications

Cavity-enhanced toroidal dipole force traps for dark-field seeking species

Cavity-enhanced toroidal dipole force traps for dark-field seeking species

Adiabatic quantum state manipulation of single trapped atoms

The Deterministic Generation of Photons by Cavity Quantum Electrodynamics

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