News: Research Highlights

Fri January 1, 2010

Thermometry and Refrigeration in a Two-Component Mott Insulator of Ultracold Atoms

In this work [1], we describe and analyze theoretically the two techniques of spin-gradient thermometry and spin gradient demagnetization cooling developed earlier by our group [2, 3].
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Thu January 1, 2009

Two-Orbital SU(N) Magnetism with Ultracold Alkaline- Earth Atoms

A. Gorshkov, M. Hermele, V. Gurarie, C. Xu, P. Julienne, J. Ye, P. Zoller, E. Demler, M. Lukin, and A. Rey, Two-Orbital SU(N) Magnetism with Ultracold Alkaline- Earth Atoms, submitted to Nature Physics, (2009).
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Thu January 1, 2009

Strong Magnetic Coupling between an Electronic Spin Qubit and a Mechanical Resonator

P. Rabl, P. Cappellaro, G. Dutt, L. Jiang, J. R. Maze, and M. D. Lukin, Strong Magnetic Coupling between an Electronic Spin Qubit and a Mechanical Resonator, Phys. Rev. B 79, 041302 (2009).
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Thu January 1, 2009

TOPS ?09

TOPS, acronym for Teaching Opportunities in the Physical Sciences, is a program to encourage physics majors to pursue careers in pre college science teaching. The 2009 season marked the seventh year that TOPS has been presented. Sponsored by CUA and NSF, TOPS brings eight undergraduate physics majors—juniors and sophomores from across the nation—to MIT for a six week teaching experience. TOPS participants live together as a group in MIT housing, along with a staff assistant from the former year. The participants work with three experienced high school physics teachers to prepare curricular material, design and practice classes, and then they move into the classroom to teach at the middle school and high school levels. The middle school experience takes place in a one-week class on heat, energy and optics at the Museum of Science, Boston.  The material is then revised and presented at the high school level in a two-week class held at MIT in the TOPS teaching workshop. The high school students come from the greater Boston community. The scientific themes of TOPS are seminal to the research program in CUA.  The PIs and graduate students make presentations on research work in progress and arrange laboratory visits, with the goal of enriching the TOPS experience as well and providing some unique teaching resources.  It appears that  about seventy percent of the TOPS participants go on to teaching careers, and in some cases the participants describe the TOPS experience as having been a decisive factor in their career decision. An article on the TOPS program appeared in Physics Today, October, 2009, p.  8.

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Thu January 1, 2009

Spin gradient thermometry for ultracold atoms in optical lattices

A major goal of current research with ultracold atoms in optical lattices is the realization of magnetic ordering.  This requires temperatures on the order of the second order tunneling rate, J2/U where U is the interaction energy and J the tunneling amplitude.  Such temperatures are about ten times less than 1 nk, the lowest temperature...
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Thu January 1, 2009

Alkaline-Earth-Metal Atoms as Few Qubit Quantum Registers

Gorshkov, A. M. Rey, A. J. Daley, M. M. Boyd, J. Ye, P. Zoller, and M. D. Lukin, Alkaline-Earth-Metal Atoms as Few Qubit Quantum Registers, Phys. Rev. Lett. 102, 110503 (2009).
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Thu January 1, 2009

When one electron is not enough ….

Most research involving ultra-cold matter has been done with atoms with one active electron (i.e. an electron outside a closed shell of electrons).  New theoretical work by CUA researchers has demonstrated that atoms with two active electrons (the so called alkaline-earth atoms)

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Thu January 1, 2009

Universal resource state for One-Way Quantum Computations

A fascinating model for quantum computing, other than the traditional quantum circuit model, is the “one-way” model that is based on simply doing single qubit measurements to a fixed, initial entangled quantum state of many qubits.  By feeding back measurement results to control the axis of subsequent measurements, any quantum circuit can be simulated and...
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Thu January 1, 2009

Preparation of decoherence-free cluster states with optical superlattices

L. Jiang, A. M. Rey, O. Romero-Isart, J. J. Garcia-Ripoli, A. Sampera, and M. D. Lukin, Preparation of decoherence-free cluster states with optical superlattices, Phys. Rev. A 79, 022309 (2009).
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