Quantum-diffractive background gas collisions in atom-trap heating and loss

Bali, Samir; O’Hara, K. M.; Gehm, Michael E.; Granade, S. R.; Thomas, J. E.

doi:10.1103/physreva.60.r29

Cited by 63 publications

(65 citation statements)

References 10 publications

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“…Using σ Rb−Rb = 2.5 × 10 −13 cm 2 [36] we find τ c = 55 s at a pressure of 1 × 10 −10 mbar. Even without resorting to cryogenic vacuum systems pressures as low as 10 −11 mbar are achievable, which would imply collisional lifetimes of order 10 minutes.…”

Section: B Background Gas Collisionsmentioning

confidence: 99%

“…The characteristic energy change for which diffractive collisions must be accounted for is ∼ 2.8 mK for Rb [36]. As we are considering a shallow FORT of depth |U m | = 1 mK we will neglect diffractive and heating effects and approximate the FORT lifetime due to background collisions mediated by a van der Waals interaction as [36] …”

Section: B Background Gas Collisionsmentioning

confidence: 99%

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Analysis of a quantum logic device based on dipole-dipole interactions of optically trapped Rydberg atoms

2005

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We present a detailed analysis and design of a neutral atom quantum logic device based on atoms in optical traps interacting via dipole-dipole coupling of Rydberg states. The dominant physical mechanisms leading to decoherence and loss of fidelity are enumerated. Our results support the feasibility of performing single and two-qubit gates at MHz rates with decoherence probability and fidelity errors at the level of 10 −3 for each operation. Current limitations and possible approaches to further improvement of the device are discussed.

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Section: B Background Gas Collisionsmentioning

confidence: 99%

Section: B Background Gas Collisionsmentioning

confidence: 99%

Analysis of a quantum logic device based on dipole-dipole interactions of optically trapped Rydberg atoms

2005

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“…In Figure 5(b), we scan the off time from 2 s to 20 s to get the probabilities of atoms still in, and then fit the curve with an exponential decay function. Under our experimental conditions, the 1/e lifetime of single atoms is about 11.4 s due to collisions with untrapped background atoms in the ultrahigh vacuum chamber and heating mechanisms caused by intensity fluctuations and photon scattering of the FORT light [24][25][26].…”

Section: The Lifetime Of Single Atomsmentioning

confidence: 99%

Single atoms in the ring lattice for quantum information processing and quantum simulation

Shi

et al. 2012

Chin. Sci. Bull.

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We have demonstrated preparing and rotating single neutral rubidium atoms in an optical ring lattice generated by a spatial light modulator, inserting two atoms into a single microscopic optical potential efficiently by dynamically reshaping the optical dipole trap, trapping single atoms in a blue detuned optical bottle beam trap, and confining single atoms into the Lamb-Dicke regime by combining red and blue detuned optical potentials. In combination with the manipulation of internal states of single atoms, the study is opening a way for research in the field of quantum information processing and quantum simulation. In this paper we review the past works and discuss the prospects. laser cooling and trapping, single atoms, quantum information processing, quantum simulation Citation:Yu S, He X D, Xu P, et al. Single atoms in the ring lattice for quantum information processing and quantum simulation. Chin Sci Bull, 2012Bull, , 57: 1931 1945Bull, , doi: 10.1007 Single neutral atoms are promising candidates for quantum information processing [6,7]. A qubit can be encoded in the internal or motional states of an atom, and multi-qubit operations can be performed based on atom-light interactions or atom-atom interactions. In particular, the hyperfine ground states of alkali-metal atoms can be considered as qubits, which can be easily manipulated via microwave radiation or Raman transitions. Several kinds of proposals for quantum gate operation were designed based on dipoledipole interactions between Rydberg atoms [8], cavity-mediated photon exchange [9] and controlled collisions [10]. Furthermore, single atom array can serve as a research platform for physical models described in other systems that are not directly investigated experimentally. The few-body simulation offers an opportunity to understand some intriguing many-body phenomena, such as superconductivity in solid materials [11], and the natural process of photosynthesis [12]. Instead of being adiabatically transferred from ultracold atomic ensemble, in our experiment single atom array is built one by one based on "collisional blockade" mechanism [13,14] that locks the atom number either zero or one in ultra small dipole trap in the presence of near-resonant laser light. Here, we demonstrate trapping single neutral rubidium atoms in the ring lattice generated by a computer controlled spatial light modulator (SLM), and present several kinds of manipulations of single atom array.

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“…The temperature of the cloud given by a time of flight measurement is 21 µK, in good agreement with the in situ measurement. As one does not expect a thermodynamic equilibrium to be reached when considering the conservative dynamics of independent particles in a trap, the good agreement between these two methods to estimate the temperature , where e is the electron charge, a0 is the Bohr radius and 0 the vacuum permittivity (data taken from [29]). Trap loss rate γi computed from Eq.…”

Section: Quasi-steady Regimementioning

confidence: 99%

Fast compression of a cold atomic cloud using a blue-detuned crossed dipole trap

et al. 2012

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We present the experimental realization of a compressible blue detuned crossed dipole trap for cold atoms allowing for fast dynamical compression (∼ 5 − 10 ms) of 5 × 10 7 Rubidium atoms up to densities of ∼ 10 13 cm −3 . The dipole trap consists of two intersecting tubes of blue-detuned laser light. These tubes are formed using a single, rapidly rotating laser beam which, for sufficiently fast rotation frequencies, can be accurately described by a quasi-static potential. The atomic cloud is compressed by dynamically reducing the trap volume leading to densities close to the Ioffe-Reggel criterion for light localization.

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Quantum-diffractive background gas collisions in atom-trap heating and loss

Cited by 63 publications

References 10 publications

Analysis of a quantum logic device based on dipole-dipole interactions of optically trapped Rydberg atoms

Analysis of a quantum logic device based on dipole-dipole interactions of optically trapped Rydberg atoms

Single atoms in the ring lattice for quantum information processing and quantum simulation

Fast compression of a cold atomic cloud using a blue-detuned crossed dipole trap

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