News

Tue January 1, 2013

Robustness of Quantum Memories Based on Majorana Zero Modes

We analyzed the rate at which quantum information encoded in zero-energy Majorana modes was lost in the presence of perturbations. We showed that information could survive for times that scale exponentially with the size of the chain both in the presence of quenching and time-dependent quadratic dephasing perturbations, even when the latter had spectral components...
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Tue January 1, 2013

Topologically Protected Quantum State Transfer in a Chiral Spin Liquid

Topology plays a central role in ensuring the robustness of a wide variety of physical phenomena. Notable examples range from the current-carrying edge states associated with the quantum Hall and the quantum spin Hall effects to topologically protected quantum memory and quantum logic operations. We proposed and analysed a topologically protected channel for the transfer...
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Tue January 1, 2013

Polaronic Model of Two-level Systems in Amorphous Solids

While two-level systems (TLSs) are ubiqitous in solid state systems, microscopic understanding of their nature remains an outstanding problem. Conflicting phenomenological models are used to describe TLSs in seemingly similar materials when probed with different experimental techniques. Specifically, bulk measurements in amorphous solids have been interpreted using the model of a tunneling atom or group...
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Tue January 1, 2013

Coupling of a Single Trapped Atom to a Nanoscale Optical Cavity

In this paper in collaboration with the Lukin group, we demonstrate for the first time deterministic coupling of a trapped atom to a nanophotonic resonator. For details see Lukin’s report.
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Tue January 1, 2013

Experimentally efficient methods for estimating the performance of quantum measurements

In this work we proposed metrics to characterize the performance of quantum measurements and provided experimentally accessible and efficient protocols to estimate these metrics. This work thus fills a gap in the characterization of quantum operations, which has until now focused on just the system evolution (via techniques such as quantum process tomography) providing a...
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Tue January 1, 2013

Pauli Paramagnetism of an Ideal Fermi Gas

Using the two lowest hyperfine states of a non-interacting ultracold Fermi gas of 6Li as pseudospin states, we have measured the magnetic susceptibility of such a system as a demonstration of the textbook physics of Pauli paramagnetism [1]. An imbalanced spin mixture of 6Li is trapped in the harmonic confinement potential at the focus of...
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Tue January 1, 2013

Dressed-State Resonant Coupling between Bright and Dark Spins in Diamond

A critical ingredient for quantum control of atom-like and hybrid systems is a better understanding of decoherence as well as the control of many-body quantum dynamics.
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Tue January 1, 2013

Unconventional Magnetism via Optical Pumping of Interacting Spin Systems

We considered strongly interacting systems of effective spins, subject to dissipative spin-flip processes associated with optical pumping. We predicted the existence of novel magnetic phases in the steady state of that system, which emerged due to the competition between coherent and dissipative processes. Specifically, for strongly anisotropic spin-spin interactions, we found ferromagnetic, antiferromagnetic, spin-densitywave, and...
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Tue January 1, 2013

Jennifer Schloss wins Hertz Foundation Fellowship

The 19th ICOLS conference takes place June 8-12 in Hokkaido, Japan, with CUA representation. Vladan Vuletic will report on a joint MIT-Harvard CUA experiment with Mikhail Lukin on switching of light with light using pulses containing only a few hundred photons. For a readable explanation of how to make light interact with light see the...
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Tue January 1, 2013

Markus Greiner wins 2013 APS Rabi Prize

The 19th ICOLS conference takes place June 8-12 in Hokkaido, Japan, with CUA representation. Vladan Vuletic will report on a joint MIT-Harvard CUA experiment with Mikhail Lukin on switching of light with light using pulses containing only a few hundred photons. For a readable explanation of how to make light interact with light see the...
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