Sub-Doppler cavity cooling beyond the Lamb-Dicke regime

Chuah, Boon Leng; Lewty, Nicholas C.; Cazan, Radu; Barrett, M. D.

doi:10.1103/physreva.87.043420

Cited by 6 publications

(5 citation statements)

References 50 publications

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“…Cavity Doppler cooling is the cooling procedure discussed above, cavity sideband cooling is used to cool free particles when they are strongly confined in LD regime [36]. Chuah et al [37] investigate the dynamics of cavity cooling of a single ion 138 Ba + beyond the LD regime. They demonstrate the cooling to sub Doppler temperature.…”

Section: Idea Of Photoassociative Cavity Coolingmentioning

confidence: 99%

Optical cooling of interacting atoms in a tightly confined trap

Naskar¹,

Saha²,

Goswami³

et al. 2017

Preprint

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In a recent paper, we have proposed a novel laser cooling scheme for reducing collisional energy of a pair of atoms by using photoassociative transitions. In that paper, we considered two atoms in free space, that is we have not considered the effects of trap on the cooling process. Here in this paper, we qualitatively discuss the possibility of extending this idea for Raman sideband cooling of a pair of interacting atoms trapped in Lamb-Dicke (LD) regime. Apart from cooling, our method may be important for manipulating on-site interaction of atoms in an optical lattice.

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Section: Idea Of Photoassociative Cavity Coolingmentioning

confidence: 99%

Optical cooling of interacting atoms in a tightly confined trap

Naskar¹,

Saha²,

Goswami³

et al. 2017

Preprint

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“…To improve the protect stage, a Raman technique could again be used with the Raman pump beam and the 650 nm repump laser to selectively transfer population from the S 1/2 m j = + 1 2 Zeeman sublevel to the D 3/2 protected manifold, which has been demonstrated previously. This would increase the fidelity of the protect stage from 50% to ∼90% [21].…”

Section: Potential Apparatus Improvementsmentioning

confidence: 99%

“…Rather than using a narrow quadrupole transition, one can also sideband cool using a Raman transition, tailored to be narrow by choices of detuning and Rabi frequencies [20], between two quantum states, e.g., electronic [21], hyperfine [22][23][24][25], or Zeeman levels [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Raman sideband cooling of aBa+138ion using a Zeeman interval

Seck¹,

Kokish²,

Dietrich³

et al. 2016

Phys. Rev. A

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Motional ground state cooling and internal state preparation are important elements for quantum logic spectroscopy (QLS), a class of quantum information processing. Since QLS does not require the high gate fidelities usually associated with quantum computation and quantum simulation, it is possible to make simplifying choices in ion species and quantum protocols at the expense of some fidelity. Here, we report sideband cooling and motional state detection protocols for 138 Ba + of sufficient fidelity for QLS without an extremely narrowband laser or the use of a species with hyperfine structure. We use the two S 1/2 Zeeman sublevels of 138 Ba + to Raman sideband cool a single ion to the motional ground state. Because of the small Zeeman splitting, near-resonant Raman sideband cooling of 138 Ba + requires only the Doppler cooling lasers and two additional AOMs. Observing the near-resonant Raman optical pumping fluorescence, we estimate a final average motional quantum numbern ≈ 0.17. We additionally employ a second, far-off-resonant laser driving Raman π-pulses between the two Zeeman sublevels to provide motional state detection for QLS and to confirm the sideband cooling efficiency, measuring a finaln = 0.15(6).

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“…First indications that this might indeed be the case were found in Paris already more than twenty years ago [5]. More systematic experimental studies of cavity-mediated laser cooling have subsequently been reported by several groups [6][7][8][9][10][11][12][13][14]. All of these experiments have their respective merits.…”

Section: Introductionmentioning

confidence: 99%

Cavity-mediated collective laser-cooling of a non-interacting atomic gas inside an asymmetric trap to very low temperatures

Ким

Deb

Beige

2018

Journal of Modern Optics

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In this paper, we identify a many-particle phonon expectation value ζ with the ability to induce collective dynamics in a non-interacting atomic gas inside an optical cavity. We then propose to utilise this expectation value to enhance the laser cooling of many atoms through a cyclic two-stage process which consists of cooling and displacement stages. During cooling stages, short laser pulses are applied. These use ζ as a resource and decrease the vibrational energy of the atomic gas by a fixed amount. Subsequent displacement stages use the asymmetry of the trapping potential to replenish the many-particle phonon expectation value ζ. Alternating both stages of the cooling process is shown to transfer the atomic gas to a final temperature which vanishes in the infinitelymany particle limit.

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Sub-Doppler cavity cooling beyond the Lamb-Dicke regime

Cited by 6 publications

References 50 publications

Optical cooling of interacting atoms in a tightly confined trap

Optical cooling of interacting atoms in a tightly confined trap

Raman sideband cooling of aBa+138ion using a Zeeman interval

Cavity-mediated collective laser-cooling of a non-interacting atomic gas inside an asymmetric trap to very low temperatures

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