7,324 research outputs found
Invariant information and complementarity in high-dimensional states
Using a generalization of the invariant information introduced by Brukner and
Zeilinger [Phys. Rev. Lett. \textbf{83}, 3354 (1999)] to high-dimensional
systems, we introduce a complementarity relation between the local and nonlocal
information for systems under the isolated environment, where
is prime or the power of prime. We also analyze the dynamics of the local
information in the decoherence process.Comment: 4 pages, 2 figure
Guidance Law Design for a Class of Dual-Spin Mortars
To minimize the cost and maximize the ease of use, a class of dual-spin mortars is designed which only rely on GPS receiver and geomagnetic measurements. However, there are some problems to be solved when the range is small, such as low correction authority and trajectory bending. Guidance law design for this mortar is detailed. Different guidance laws were designed for the ascending and descending segments, respectively. By taking variable parameter guidance law in the vertical plane and using compensation in the lateral plane, the problems mentioned above were resolved. Roll angle resolving algorithms with geomagnetic measurements were demonstrated and the experiment results proved to be effective. In order to verify the effectiveness, Seven-Degrees-of-Freedom (7-DOF) rigid ballistic model were established and hardware in the loop simulation was introduced. After the transform function of the actuator was obtained, the control model of the shell was improved. The results of the Monte Carlo simulation demonstrate that the guidance law is suitable and the mortar can be effectively controlled
Normal density and moment of inertia of a moving superfluid
In this work, the normal density and moment of inertia of a moving
superfluid are investigated. We find that, even at zero temperature, there
exists a finite normal density for the moving superfluid. When the velocity of
superfluid reaches sound velocity, the normal density becomes total mass
density , which indicates that the system losses superfluidity. At the
same time, the Landau's critical velocity also becomes zero. The existence of
the non-zero normal density is attributed to the coupling between the motion of
superflow and density fluctuation in transverse directions. With Josephson
relation, the superfluid density is also calculated and the identity
holds. Further more, we find that the finite normal
density also results in a quantized moment of inertia in a moving superfluid
trapped by a ring. The normal density and moment of inertia at zero temperature
could be verified experimentally by measuring the angular momentum of a moving
superfluid in a ring trap.Comment: 6 page
Novel Schemes for Directly Measuring Entanglement of General States
An intrinsic relation between maximally entangled states and entanglement
measures is revealed, which plays a role in establishing connections for
different entanglement quantifiers. We exploit the basic idea and propose a
framework to construct schemes for directly measuring entanglement of general
states. In particular, we demonstrate that rank-1 local factorizable projective
measurements, which are achievable with only one copy of entangled state
involved at a time in a sequential way, are sufficient to directly determine
the concurrence of arbitrary two-qubit entangled state
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An unprecedented 2D covalent organic framework with an htb net topology.
A 2D imine-linked COF with a hitherto unreported htb type topology was synthesized from a linear diamine linker and a judiciously designed tetra-aldehyde building block. This work opens the door to the development of COFs with unprecedented topologies and may broaden the scope of COF functional materials by pore size and pore surface engineering
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