Photon-by-photon feedback control of a single-atom trajectory

Kubanek, Alexander; Koch, Markus; Sames, Christian; Ourjoumtsev, Alexei; Pinkse, Pepijn W. H.; Murr, Karim; Rempe, Gerhard

doi:10.1038/nature08563

Cited by 79 publications

(98 citation statements)

References 21 publications

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“…Subsequent feedback onto the trap allowed to increase the atomic storage time [80]. With further improvement of the experimental setup and the electronics [81] and a higher output-coupling efficiency of the cavity, cooling of the atomic motion and storage times exceeding 1s have been demonstrated [82].…”

Section: Techniques To Control the Position And Motion Of Atoms In A mentioning

confidence: 99%

A Controlled Phase Gate Between a Single Atom and an Optical Photon

Reiserer

2016

Springer Theses

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SummaryThis thesis reports on the experimental implementation of a deterministic interaction mechanism between flying optical photons and a single trapped atom. To this end, single rubidium atoms are trapped in a three-dimensional optical lattice at the center of an optical cavity in the strong coupling regime. Full control over the atomic state -its position, its motion, and its electronic state -is achieved with laser beams applied along the resonator and from the side. When faint laser pulses are reflected from the resonator, the combined atom-photon state acquires a state-dependent phase shift. In a first series of experiments, this is employed to nondestructively detect optical photons by measuring the atomic state after the reflection process. In a second series of experiments, quantum bits are encoded in the polarization of the laser pulse and in the Zeeman state of the atom. The state-dependent phase shift then mediates a deterministic universal quantum gate between the atom and one or two successively reflected photons, which is used to generate entangled atom-photon, atom-photon-photon, and photon-photon states out of separable input states.3 4

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Section: Techniques To Control the Position And Motion Of Atoms In A mentioning

confidence: 99%

A Controlled Phase Gate Between a Single Atom and an Optical Photon

Reiserer

2016

Springer Theses

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“…This is achieved by a combination of dipole trapping in two (or three) orthogonal blue or red detuned standing light waves [10] and cavity cooling [11,12] or, most recently, feedback cooling [13,14]. The standing light waves can spatially be adjusted in such a way that the atom is trapped at the desired position, as verified by means of a CCD camera which records fluorescence light emitted by the atom, for example during cooling intervals and state preparation.…”

Section: Single-atom Localizationmentioning

confidence: 99%

Quantum optics and cavity QED Quantum network with individual atoms and photons

Rempe

2013

EPJ Web of Conferences

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Abstract. Quantum physics allows a new approach to information processing. A grand challenge is the realization of a quantum network for long-distance quantum communication and large-scale quantum simulation. This paper highlights a first implementation of an elementary quantum network with two fibre-linked high-finesse optical resonators, each containing a single quasi-permanently trapped atom as a stationary quantum node. Reversible quantum state transfer between the two atoms and entanglement of the two atoms are achieved by the controlled exchange of a time-symmetric single photon. This approach to quantum networking is efficient and offers a clear perspective for scalability. It allows for arbitrary topologies and features controlled connectivity as well as, in principle, infinite-range interactions. Our system constitutes the largest man-made material quantum system to date and is an ideal test bed for fundamental investigations, e.g. quantum non-locality.

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“…One can envision its application in single atom quantum dynamics studies [46][47][48] which would benefit from accurate positioning. This include feedback [51], cavity [49,50] or ground-state cooling [52]. It also naturally applies to cavity QED studies with ensembles, e.g.…”

Section: Future Prospectsmentioning

confidence: 99%

Sub-micron positioning of trapped ions with respect to the absolute center of a standing-wave cavity field

et al. 2013

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We demonstrate that it is possible, with sub-micron precision, to locate the absolute center of a Fabry-Pérot resonator oriented along the rf-field-free axis of a linear Paul trap through the application of two simultaneously resonating optical fields. In particular, we apply a probe field, which is near-resonant with an electronic transition of trapped ions, simultaneously with an offresonant strong field acting as a periodic AC Stark-shifting potential. Through the resulting spatially modulated fluorescence signal we can find the cavity center of an 11.7 mm-long symmetric FabryPérot cavity with a precision of ±135 nm, which is smaller than the periodicity of the individual standing wave fields. This can e.g. be used to position the minimum of the axial trap potential with respect to the center of the cavity at any location along the cavity mode.

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Photon-by-photon feedback control of a single-atom trajectory

Cited by 79 publications

References 21 publications

A Controlled Phase Gate Between a Single Atom and an Optical Photon

A Controlled Phase Gate Between a Single Atom and an Optical Photon

Quantum optics and cavity QED Quantum network with individual atoms and photons

Sub-micron positioning of trapped ions with respect to the absolute center of a standing-wave cavity field

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