Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:0711.0044 · Physical Review A

Entanglement of group-II-like atoms with fast measurement for quantum information processing

R. Stock, Nathan S. Babcock, Mark G. Raizen, Barry C. Sanders

Published Aug 1, 2008• 30 citations
arXivHTMLPDF

Abstract

We construct a scheme for the preparation, pairwise entanglement via exchange interaction, manipulation, and measurement of individual group-II-like neutral atoms (Yb, Sr, etc.). Group-II-like atoms proffer important advantages over alkali metals, including long-lived optical-transition qubits that enable fast manipulation and measurement. Our scheme provides a promising approach for producing weighted graph states, entangled resources for quantum communication, and possible application to fundamental tests of Bell inequalities that close both detection and locality loopholes.

DOI
10.1103/physreva.78.022301

Related papers

Entangling identical bosons in optical tweezers via exchange interaction

N S Babcock, R Stock, M G Raizen +1 more

We first devise a scheme to perform a universal entangling gate via controlled collisions between pairs of atomic qubits trapped with optical tweezers. Second, we present a modification to this scheme to allow for the preparation of atomic Bell pairs via selective excitation, suitable for quantum-information-processing applications that do not require universality. Both these schemes are enabled by the inherent symmetries of identical composite particles, as originally proposed by Hayes et al. Our scheme provides a technique for producing weighted graph states, entangled resources for quantum communication, and a promising approach to performing a “loophole free” Bell test in a single laboratory.PACS Nos.: 03.65.Ud, 03.67.Mn, 32.80.Pj, 42.50.Vk

arXiv:0712.2486•Canadian Journal of Physics•Apr 1, 2008•6 citations

1Entangling identical bosons in optical tweezers via exchange interaction

Nathan S. Babcock, Rene ́ Stock, Mark G. Raizen +1 more

Abstract: We first devise a scheme to perform a universal entangling gate via controlled collisions between pairs of atomic qubits trapped with optical tweezers. Second, we present a modification to this scheme to allow the preparation of atomic Bell pairs via selective excitation, suitable for quantum information processing applications that do not require universality. Both these schemes are enabled by the inherent symmetries of identical composite particles, as originally proposed by Hayes et al. Our scheme provides a technique for producing weighted graph states, entangled resources for quantum communication, and a promising approach to performing a “loophole free ” Bell test in a single laboratory. Résume ́: [Traduit par la rédaction] 1.

•Aug 18, 2016•4 citations

Manipulating Single Atoms

Dieter Meschede

Single neutral atoms are interesting candidates for serving as qubits, the elementary objects of quantum information processing. We give an overview of experimental methods which allow us to prepare, detect, and manipulate individual neutral atoms with excellent efficiency in an optical dipole trap. We have measured long coherence times for atomic quantum state superpositions and identified the relevant decoherence mechanisms. As an application we have constructed a neutral atom quantum register from a string of atoms which can be selectively prepared in arbitrary quantum states.

AIP conference proceedings•Jan 1, 2005•2 citations

Rapid measurement of atomic clock-state qubits for violating Bell inequalities

R. Stock, Nathan S. Babcock, Mark G. Raizen +1 more

Optical clock-transitions such as the ones in Ytterbium are prime candidates for encoding qubits for quantum information processing applications due to very low decoherence rates. In this work, we investigate the challenges involved in using these prime candidates for fundamental tests of quantum mechanics. We design entangling operations for pairs of indistinguishable atoms trapped in optical tweezers, as well as determine the feasibility of rapid qubit rotation and measurement of qubits encoded in these desirable low-decoherence clock transitions. In particular, we propose multi-photon transitions for fast rotation of qubits, followed by ultrafast readout via resonant multiphoton ionization. The rapid measurement of atomic qubits is crucial for high-speed synchronization of quantum information processors, but is also of interest for tests of Bell inequalities. We investigate a Bell inequality test that avoids the detection loophole in entangled qubits, which are spacelike separated over only a few meters.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Sep 13, 2007•0 citations

Long-distance atom-photon entanglement

Wenjamin Rosenfeld, Fredrik Hocke, Florian Henkel +5 more

Atoms and photons are well-suited candidates for quantum information processing and quantum communication. While atoms can be used for storage and manipulation, photons are ideal carriers for the transfer of quantum information. Our group pursues the goal of creating a basic node of a quantum communication network by entangling two independently trapped87Rb atoms over a large distance. Besides its prospects in quantum communication (e.g. quantum repeater), this would also allow a loophole-free test of Bell's inequality which can help to conclusively answer the long-standing question about the completeness of the quantum theory. The key ingredient is atom-photon entanglement which will enable us to entangle two atoms by entanglement swapping. We plan to achieve a distance of 300m between two independent single atom traps.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2009•0 citations

Entanglement and rapid measurement of clock-state qubits in Yb or Sr for quantum information processing

Nathan S. Babcock, R. Stock, Barry C. Sanders

We devise protocols for entangling and rapidly measuring qubits encoded in the clock transitions in Yb or Sr. Our work provides concrete guidelines for experimental realizations of quantum computing and fundamental tests of quantum mechanics.

Quantum Electronics and Laser Science Conference•May 1, 2007•0 citations
We construct a scheme for the preparation, pairwise entanglement via exchange interaction, manipulation, and measurement of individual group-II-like neutral atoms (Yb, Sr, etc.). Group-II-like atoms proffer important advantages over alkali metals, including long-lived optical-transition qubits that enable fast manipulation and measurement. Our scheme provides a promising approach for producing weighted graph states, entangled resources for quantum communication, and possible application to fundamental tests of Bell inequalities that close both detection and locality loopholes.
We first devise a scheme to perform a universal entangling gate via controlled collisions between pairs of atomic qubits trapped with optical tweezers. Second, we present a modification to this scheme to allow for the preparation of atomic Bell pairs via selective excitation, suitable for quantum-information-processing applications that do not require universality. Both these schemes are enabled by the inherent symmetries of identical composite particles, as originally proposed by Hayes et al. Our scheme provides a technique for producing weighted graph states, entangled resources for quantum communication, and a promising approach to performing a “loophole free” Bell test in a single laboratory.PACS Nos.: 03.65.Ud, 03.67.Mn, 32.80.Pj, 42.50.Vk
Abstract: We first devise a scheme to perform a universal entangling gate via controlled collisions between pairs of atomic qubits trapped with optical tweezers. Second, we present a modification to this scheme to allow the preparation of atomic Bell pairs via selective excitation, suitable for quantum information processing applications that do not require universality. Both these schemes are enabled by the inherent symmetries of identical composite particles, as originally proposed by Hayes et al. Our scheme provides a technique for producing weighted graph states, entangled resources for quantum communication, and a promising approach to performing a “loophole free ” Bell test in a single laboratory. Résume ́: [Traduit par la rédaction] 1.
Single neutral atoms are interesting candidates for serving as qubits, the elementary objects of quantum information processing. We give an overview of experimental methods which allow us to prepare, detect, and manipulate individual neutral atoms with excellent efficiency in an optical dipole trap. We have measured long coherence times for atomic quantum state superpositions and identified the relevant decoherence mechanisms. As an application we have constructed a neutral atom quantum register from a string of atoms which can be selectively prepared in arbitrary quantum states.
Optical clock-transitions such as the ones in Ytterbium are prime candidates for encoding qubits for quantum information processing applications due to very low decoherence rates. In this work, we investigate the challenges involved in using these prime candidates for fundamental tests of quantum mechanics. We design entangling operations for pairs of indistinguishable atoms trapped in optical tweezers, as well as determine the feasibility of rapid qubit rotation and measurement of qubits encoded in these desirable low-decoherence clock transitions. In particular, we propose multi-photon transitions for fast rotation of qubits, followed by ultrafast readout via resonant multiphoton ionization. The rapid measurement of atomic qubits is crucial for high-speed synchronization of quantum information processors, but is also of interest for tests of Bell inequalities. We investigate a Bell inequality test that avoids the detection loophole in entangled qubits, which are spacelike separated over only a few meters.
Atoms and photons are well-suited candidates for quantum information processing and quantum communication. While atoms can be used for storage and manipulation, photons are ideal carriers for the transfer of quantum information. Our group pursues the goal of creating a basic node of a quantum communication network by entangling two independently trapped87Rb atoms over a large distance. Besides its prospects in quantum communication (e.g. quantum repeater), this would also allow a loophole-free test of Bell's inequality which can help to conclusively answer the long-standing question about the completeness of the quantum theory. The key ingredient is atom-photon entanglement which will enable us to entangle two atoms by entanglement swapping. We plan to achieve a distance of 300m between two independent single atom traps.