Highly controlled optical transport of cold atoms into a hollow-core fiber

Abstract

We report on an efficient and highly controlled cold atom hollow-core fiber interface, suitable for quantum simulation, information, and sensing. The main focus of this manuscript is a detailed study on transporting cold atoms into the fiber using an optical conveyor belt. We discuss how we can precisely control the spatial, thermal, and temporal distribution of the atoms by, e.g., varying the speed at which the atoms are transported or adjusting the depth of the transport potential according to the atomic position. We characterize the transport of atoms to the fiber tip for these different parameters. In particular, we show that by adapting the transport potential we can lower the temperature of the transported atoms by a factor of 6, while reducing the transport efficiency only by a factor 2. For atoms transported inside the fiber, we can obtain a transport efficiency into the fiber of more than 40% and we study the influence of the different transport parameters on the time-dependent optical depth signal. When comparing our measurements to the results of a classical transport simulation, we find a good qualitative agreement.

Light-shift spectroscopy of optically trapped atomic ensembles

“…In many cases optical dipole traps are used to localise the atomic ensemble in a controllable way. These can be used to hold the atomic sample for a long duration [12,17,18] or to transport the atoms into a confined geometry such as a hollow-core fibre [19][20][21][22][23][24] or near to a structured device such as an atomic chip [25][26][27][28].…”

Optimal pulse propagation in an inhomogeneously gas-filled hollow-core fiber

“…where ∆ = ω c − ω 32 denotes the one-photon detuning and δ = ω p − ω c − ω 21 the two-photon detuning as in Eq. (11). In a matrix representation this reads…”

Noise Sensitivities for an Atom Shuttled by a Moving Optical Lattice via Shortcuts to Adiabaticity

“…We shall focus on the use of the lattice as a conveyor belt to transport atoms, although lattices may as well be moved for other purposes, e.g., to study the stability of superfluidity [ 1 ] or, by periodic driving (shaking), to control different aspects of single atoms or many-body systems [ 2 , 3 ]. Optical lattices are interesting for transporting atoms because of several useful properties: The possibility to have hundreds or thousands of minima (even more within hollow fibers [ 4 , 5 ]), trapping forces that are much larger than in single beam optical tweezers, parameter flexibility including time-dependent control, or the possibility to implement lattices that depend on the internal state [ 6 ]. The atoms may be transported between a preparation area to a “science chamber” [ 4 , 7 , 8 ], and the coherent control of individual atoms has been demonstrated towards on-demand positioning and delivery and the design of quantum registers [ 9 , 10 , 11 , 12 , 13 , 14 ].…”

“…The atoms may be transported between a preparation area to a “science chamber” [ 4 , 7 , 8 ], and the coherent control of individual atoms has been demonstrated towards on-demand positioning and delivery and the design of quantum registers [ 9 , 10 , 11 , 12 , 13 , 14 ]. Other applications include guided interferometry and precision measurement [ 4 , 5 , 15 , 16 ], quantum computation schemes via messenger atoms among distant register qubits [ 17 ], quantum random walks [ 18 , 19 ], quantum simulators [ 20 ], catapulting (launching) atoms with specified velocities [ 10 , 21 ], the creation of entangled states [ 22 , 23 ], integrating cold atoms with photonic platforms [ 24 ], and implementing two-qubit quantum gates and gate arrays [ 22 , 25 , 26 ].…”