Efficient formation of ground-state ultracold molecules via STIRAP from the continuum at a Feshbach resonance

Kuznetsova, Elena; Gacesa, Marko; Pellegrini, Philippe; Yelin, Susanne F.; Côté, Robin

doi:10.1088/1367-2630/11/5/055028

Cited by 47 publications

(66 citation statements)

References 34 publications

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“…At ultralow temperatures, scattering of Rb and Li in these states is elastic, preventing atom loss and qubit decoherence [14,26,27]. For the two-qubit gate, Li is transferred into |1, 1 , where a Feshbach resonance occurs at B ∼ 649 G for the |1, 1 Rb + |1, 1 Li channel, strongly enhancing the atom-molecule conversion efficiency [26,27]. Qubits during storage and one-qubit operations, and "enabled" (primed) qubits during a two-qubit gate are:…”

Section: Model Descriptionmentioning

confidence: 99%

“…Namely, the wavefunction overlap of the intermediate molecular state |v e with either the initial atomic or the final molecular state will be small, requiring large intensity of the laser pulse to provide Rabi frequency sufficiently large for fast transfer. Unfavorable wave-function overlap can be alleviated by using Feshbach optimized photo association (FOPA) [26,27]. A Feshbach resonance, tunable by an external magnetic field, occurs when the energy of a bound level from a closed channel coincides with that of the continuum state.…”

Section: Phase Gate Implementationmentioning

confidence: 99%

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An atom–molecule platform for quantum computing

Kuznetsova

Yelin

Côté

2011

Quantum Inf Process

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We propose a combined atom-molecule system for quantum information processing in individual traps, such as provided by optical lattices. In this platform, different species of atoms-one atom carrying a qubit and the other enabling the interaction-are used to store and process quantum information via intermediate molecular states. We show how gates, initialization, and readout operations could be implemented using this approach. In particular, we describe in some detail the implementation of a two-qubit phase gate in which a pair of atoms is transferred into the ground rovibrational state of a polar molecule with a large dipole moment, thus allowing atoms transferred into molecules to interact via their dipole-dipole interaction. We also discuss how the reverse process could be used as a non-destructive readout tool of molecular qubit states. Finally, we generalize these ideas to use a decoherence-free subspace for qubit encoding to minimize the decoherence due to magnetic field fluctuations. In this case, qubits will be encoded into field-insensitive states of two identical atoms, while a third atom of a different species will be used to realize a phase gate.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Phase Gate Implementationmentioning

confidence: 99%

An atom–molecule platform for quantum computing

Kuznetsova

Yelin

Côté

2011

Quantum Inf Process

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“…In this section we describe photoassociative Stimulated Raman Adiabatic Passage (STIRAP) near a Feshbach resonance in a thermal atomic gas (49). We show that it is possible to use low intensity laser pulses to directly excite pairs of atoms in the continuum near a Feshbach resonance and to transfer nearly the entire atomic population to the lowest rovibrational level of the molecular ground state.…”

Section: Efficient Formation Of Ground State Ultracold Molecules Via mentioning

confidence: 99%

Coherent Laser Manipulation of Ultracold Molecules

Kuznetsova¹,

Côté²,

Yelin³

2011

Femtosecond-Scale Optics

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“…In the following, the Feshbach optimized DPA (FOPA) [61] to the absolute vibrational ground state of 6 Li-87 Rb in the electronic X 1 Σ + state is considered to examine the applicability of SC approaches to study processes of molecule creation. We consider this case since it has an interest on its own for the creation of bound ultracold molecules.…”

Section: Photoassociation Ofmentioning

confidence: 99%

Mimicking multichannel scattering with single-channel approaches

et al. 2010

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The collision of two atoms is an intrinsic multi-channel (MC) problem as becomes especially obvious in the presence of Feshbach resonances. Due to its complexity, however, single-channel (SC) approximations, which reproduce the long-range behavior of the open channel, are often applied in calculations. In this work the complete MC problem is solved numerically for the magnetic Feshbach resonances (MFRs) in collisions between generic ultracold 6 Li and 87 Rb atoms in the ground state and in the presence of a static magnetic field B. The obtained MC solutions are used to test various existing as well as presently developed SC approaches. It was found that many aspects even at short internuclear distances are qualitatively well reflected. This can be used to investigate molecular processes in the presence of an external trap or in many-body systems that can be feasibly treated only within the framework of the SC approximation. The applicability of various SC approximations is tested for a transition to the absolute vibrational ground state around an MFR. The conformance of the SC approaches is explained by the two-channel approximation for the MFR.

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Efficient formation of ground-state ultracold molecules via STIRAP from the continuum at a Feshbach resonance

Cited by 47 publications

References 34 publications

An atom–molecule platform for quantum computing

An atom–molecule platform for quantum computing

Coherent Laser Manipulation of Ultracold Molecules

Mimicking multichannel scattering with single-channel approaches

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