158 research outputs found
Electromagnetically induced transparency-based slow and stored light in warm atoms
This paper reviews recent efforts to realize a high-efficiency memory for optical pulses using slow and stored light based on electromagnetically induced transparency (EIT) in ensembles of warm atoms in vapor cells. After a brief summary of basic continuous-wave and dynamic EIT properties, studies using weak classical signal pulses in optically dense coherent media are discussed, including optimization strategies for stored light efficiency and pulse-shape control, and modification of EIT and slow/stored light spectral properties due to atomic motion. Quantum memory demonstrations using both single photons and pulses of squeezed light are then reviewed. Finally a brief comparison with other approaches is presented
Investigation of laser polarized xenon magnetic resonance
Ground-based investigations of a new biomedical diagnostic technology: nuclear magnetic resonance of laser polarized noble gas are addressed. The specific research tasks discussed are: (1) Development of a large-scale noble gas polarization system; (2) biomedical investigations using laser polarized noble gas in conventional (high magnetic field) NMR systems; and (3) the development and application of a low magnetic field system for laser polarized noble gas NMR
Tunable negative refraction without absorption via electromagnetically induced chirality
We show that negative refraction with minimal absorption can be obtained by
means of quantum interference effects similar to electromagnetically induced
transparency. Coupling a magnetic dipole transition coherently with an electric
dipole transition leads to electromagnetically induced chirality, which can
provide negative refraction without requiring negative permeability, and also
suppresses absorption. This technique allows negative refraction in the optical
regime at densities where the magnetic susceptibility is still small and with
refraction/absorption ratios that are orders of magnitude larger than those
achievable previously. Furthermore, the value of the refractive index can be
fine-tuned via external laser fields, which is essential for practical
realization of sub-diffraction-limit imaging.Comment: 4 pages, 5 figures (shortened version, submitted to PRL
Solid-state electronic spin coherence time approaching one second
Solid-state electronic spin systems such as nitrogen-vacancy (NV) color
centers in diamond are promising for applications of quantum information,
sensing, and metrology. However, a key challenge for such solid-state systems
is to realize a spin coherence time that is much longer than the time for
quantum spin manipulation protocols. Here we demonstrate an improvement of more
than two orders of magnitude in the spin coherence time () of NV centers
compared to previous measurements: s at 77 K, which enables
coherent NV spin manipulations before decoherence. We employed
dynamical decoupling pulse sequences to suppress NV spin decoherence due to
magnetic noise, and found that is limited to approximately half of the
longitudinal spin relaxation time () over a wide range of temperatures,
which we attribute to phonon-induced decoherence. Our results apply to
ensembles of NV spins and do not depend on the optimal choice of a specific NV,
which could advance quantum sensing, enable squeezing and many-body
entanglement in solid-state spin ensembles, and open a path to simulating a
wide range of driven, interaction-dominated quantum many-body Hamiltonians
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