1,880 research outputs found
Extended Object Tracking: Introduction, Overview and Applications
This article provides an elaborate overview of current research in extended
object tracking. We provide a clear definition of the extended object tracking
problem and discuss its delimitation to other types of object tracking. Next,
different aspects of extended object modelling are extensively discussed.
Subsequently, we give a tutorial introduction to two basic and well used
extended object tracking approaches - the random matrix approach and the Kalman
filter-based approach for star-convex shapes. The next part treats the tracking
of multiple extended objects and elaborates how the large number of feasible
association hypotheses can be tackled using both Random Finite Set (RFS) and
Non-RFS multi-object trackers. The article concludes with a summary of current
applications, where four example applications involving camera, X-band radar,
light detection and ranging (lidar), red-green-blue-depth (RGB-D) sensors are
highlighted.Comment: 30 pages, 19 figure
Generating quantum discord between two distant Bose-Einstein condensates with Bell-like detection
We propose a technique that enables the creation of quantum discord between
two distant nodes, each containing a cavity consist of the Bose-Einstein
condensate, by applying a non-ideal Bell-like detection on the output modes of
optical cavities. We find the covariance matrix of the system after the
non-ideal Bell-like detection, showing explicitly that one enables manipulation
of the quantum correlations, and particularly quantum discord, between remote
Bose-Einstein condensates. We also find that the non-ideal Bell-like detection
can create entanglement between distant Bose-Einstein condensates at the two
remote site
Quantum experiments with human eyes as detectors based on cloning via stimulated emission
We show theoretically that the multi-photon states obtained by cloning
single-photon qubits via stimulated emission can be distinguished with the
naked human eye with high efficiency and fidelity. Focusing on the
"micro-macro" situation realized in a recent experiment [F. De Martini, F.
Sciarrino, and C. Vitelli, Phys. Rev. Lett. 100, 253601 (2008)], where one
photon from an original entangled pair is detected directly, whereas the other
one is greatly amplified, we show that performing a Bell experiment with
human-eye detectors for the amplified photon appears realistic, even when
losses are taken into account. The great robustness of these results under
photon loss leads to an apparent paradox, which we resolve by noting that the
Bell violation proves the existence of entanglement before the amplification
process. However, we also prove that there is genuine micro-macro entanglement
even for high loss.Comment: 5 pages, 3 figure
Quantum cryptography with an ideal local relay
We consider two remote parties connected to a relay by two quantum channels.
To generate a secret key, they transmit coherent states to the relay, where the
states are subject to a continuous-variable (CV) Bell detection. We study the
ideal case where Alice's channel is lossless, i.e., the relay is locally
situated in her lab and the Bell detection is performed with unit efficiency.
This configuration allows us to explore the optimal performances achievable by
CV measurement-device-independent (MDI) quantum key distribution (QKD). This
corresponds to the limit of a trusted local relay, where the detection loss can
be re-scaled. Our theoretical analysis is confirmed by an experimental
simulation where 10^-4 secret bits per use can potentially be distributed at
170km assuming ideal reconciliation.Comment: in Proceedings of the SPIE Security + Defence 2015 conference on
Quantum Information Science and Technology, Toulouse, France (21-24 September
2015) - Paper 9648-4
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