3,019 research outputs found
Quantum memory and non-demolition measurement of single phonon state with nitrogen-vacancy centers ensemble
In diamond, the mechanical vibration induced strain can lead to interaction
between the mechanical mode and the nitrogen-vecancy (NV) centers. In this
work, we propose to utilize the strain induced coupling for the quantum
non-demolition (QND) single phonon measurement and memory in diamond. The
single phonon in a diamond mechanical resonator can be perfectly absorbed and
emitted by the NV centers ensemble (NVE) with adiabatically tuning the
microwave driving. An optical laser drives the NVE to the excited states, which
have much larger coupling strength to the mechanical mode. By adiabatically
eliminating the excited states under large detuning limit, the effective
coupling between the mechanical mode and the NVE can be used for QND
measurement of the single phonon state. Under realistic experimental
conditions, we numerically simulate the scheme. It is found that the fidelity
of the absorbing and emitting process can reach a much high value. The overlap
between the input and the output phonon shapes can reach .Comment: 7 pages, 3 figure
Reverse Nearest Neighbor Heat Maps: A Tool for Influence Exploration
We study the problem of constructing a reverse nearest neighbor (RNN) heat
map by finding the RNN set of every point in a two-dimensional space. Based on
the RNN set of a point, we obtain a quantitative influence (i.e., heat) for the
point. The heat map provides a global view on the influence distribution in the
space, and hence supports exploratory analyses in many applications such as
marketing and resource management. To construct such a heat map, we first
reduce it to a problem called Region Coloring (RC), which divides the space
into disjoint regions within which all the points have the same RNN set. We
then propose a novel algorithm named CREST that efficiently solves the RC
problem by labeling each region with the heat value of its containing points.
In CREST, we propose innovative techniques to avoid processing expensive RNN
queries and greatly reduce the number of region labeling operations. We perform
detailed analyses on the complexity of CREST and lower bounds of the RC
problem, and prove that CREST is asymptotically optimal in the worst case.
Extensive experiments with both real and synthetic data sets demonstrate that
CREST outperforms alternative algorithms by several orders of magnitude.Comment: Accepted to appear in ICDE 201
Intramolecular Torque, an Indicator of the Internal Rotation Direction of Rotor Molecules and Similar Systems
Torque is ubiquitous in many molecular systems, including collisions,
chemical reactions, vibrations, electronic excitations and especially rotor
molecules. We present a straightforward theoretical method based on forces
acting on atoms and obtained from atomistic quantum mechanics calculations, to
quickly and qualitatively determine whether a molecule or sub-unit thereof has
a tendency to rotation and, if so, around which axis and in which sense:
clockwise or counterclockwise. The method also indicates which atoms, if any,
are predominant in causing the rotation. Our computational approach can in
general efficiently provide insights into the rotational ability of many
molecules and help to theoretically screen or modify them in advance of
experiments or before analyzing their rotational behavior in more detail with
more extensive computations guided by the results from the torque approach. As
an example, we demonstrate the effectiveness of the approach using a specific
light-driven molecular rotary motor which was successfully synthesized and
analyzed in prior experiments and simulations.Comment: 11 pages, 4 figures, 1 SI fil
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