1,677 research outputs found
Solid state optical interconnect between distant superconducting quantum chips
We propose a design for a quantum interface exploiting the electron spins in
crystals to swap the quantum states between the optical and microwave. Using
sideband driving of a superconducting flux qubit and a combined
cavity/solid-state spin ensemble Raman transition, we demonstrate how a
stimulated Raman adiabatic passage (STIRAP)-type operation can swap the quantum
state between a superconducting flux qubit and an optical cavity mode with a
fidelity higher than . We further consider two distant superconducting
qubits with their respective interfaces joined by an optical fiber and show a
quantum transfer fidelity exceeding between the two distant qubits.Comment: 5 figures, 5 page
Detection of a weak magnetic field via cavity enhanced Faraday rotation
We study the sensitive detection of a weak static magnetic field via Faraday
rotation induced by an ensemble of spins in a bimodal degenerate microwave
cavity. We determine the limit of the resolution for the sensitivity of the
magnetometry achieved using either single-photon or multiphoton inputs. For the
case of a microwave cavity containing an ensemble of Nitrogen-vacancy defects
in diamond, we obtain a magnetometry sensitivity exceeding
0.5~\text{\nano\tesla}/\sqrt{\text{\hertz}}, utilizing a single photon probe
field, while for a multiphoton input we achieve a sensitivity about 1
\text{\femto\tesla}/\sqrt{\text{\hertz}}, using a coherent probe microwave
field with power of P_\text{in}=1~\text{\nano\watt}.Comment: 8 pages, 7 figure
Cavity-free nondestructive detection of a single optical photon
Detecting a single photon without absorbing it is a long standing challenge
in quantum optics. All experiments demonstrating the nondestructive detection
of a photon make use of a high quality cavity. We present a cavity free scheme
for nondestructive single-photon detection. By pumping a nonlinear medium we
implement an inter-field Rabi-oscillation which leads to a ?pi phase shift on
weak probe coherent laser field in the presence of a single signal photon
without destroying the signal photon. Our cavity-free scheme operates with a
fast intrinsic time scale in comparison with similar cavity-based schemes. We
implement a full real-space multimode numerical analysis of the interacting
photonic modes and confirm the validity of our nondestructive scheme in the
multimode case.Comment: 4 figures, 5 page
Poisson multi-Bernoulli mixture trackers: continuity through random finite sets of trajectories
The Poisson multi-Bernoulli mixture (PMBM) is an unlabelled multi-target
distribution for which the prediction and update are closed. It has a Poisson
birth process, and new Bernoulli components are generated on each new
measurement as a part of the Bayesian measurement update. The PMBM filter is
similar to the multiple hypothesis tracker (MHT), but seemingly does not
provide explicit continuity between time steps. This paper considers a recently
developed formulation of the multi-target tracking problem as a random finite
set (RFS) of trajectories, and derives two trajectory RFS filters, called PMBM
trackers. The PMBM trackers efficiently estimate the set of trajectories, and
share hypothesis structure with the PMBM filter. By showing that the prediction
and update in the PMBM filter can be viewed as an efficient method for
calculating the time marginals of the RFS of trajectories, continuity in the
same sense as MHT is established for the PMBM filter
DND1 Expression and Function in the Porcine Ovary, Oocyte and Embryo
DND1 (dead end homolog 1), belonging to the RNA binding protein family, can impact miRNA:mRNA functional pathway and in turn may contribute to maintaining normal oocyte growth and quality as well as embryo development following fertilization. To characterize DND1 in pig maturing oocytes and cumulus cells, and early embryos, we examined DND1 mRNA and protein expression using quantitative RT-PCR, Western blot and immunostaining. We found: (1) DND1 protein is expressed during pig follicle development; (2) DND1 is dynamically expressed at both mRNA and protein level in the maturing oocyte and early in vitro fertilized embryos; (3) DND1 mRNA is expressed in cumulus cells surrounding the maturing oocyte; and (4) DND1 protein is localized in the cytoplasm of pig maturing oocytes and early embryos. Our work provides useful data for functional study of DND1 proteins in female gametogenesis and developing embryos, which will benefit animal reproduction health and provides foundational knowledge for improving swine reproductive efficiency
Metaphor research in the 21st century : a bibliographic analysis
Metaphor is widely used in human communication. The cohort of scholars studying metaphor in various fields is continuously growing, but very few work has been done in bibliographical analysis of metaphor research. This paper examines the advancements in metaphor research from 2000 to 2017. Using data retrieved from Microsoft Academic Graph and Web of Science, this paper makes a macro analysis of metaphor research, and expounds the underlying patterns of its development. Taking into consideration sub-fields of metaphor research, the internal analysis of metaphor research is carried out from a micro perspective to reveal the evolution of research topics and the inherent relationships among them. This paper provides novel insights into the current state of the art of metaphor research as well as future trends in this field, which may spark new research interests in metaphor from both linguistic and interdisciplinary perspectives. © 2020, ComSIS Consortium. All rights reserved
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