5,894 research outputs found
From Petrov-Einstein-Dilaton-Axion to Navier-Stokes equation in anisotropic model
In this paper we generalize the previous works to the case that the
near-horizon dynamics of the Einstein-Dilaton-Axion theory can be governed by
the incompressible Navier-Stokes equation via imposing the Petrov-like boundary
condition on hypersurfaces in the non-relativistic and near-horizon limit. The
dynamical shear viscosity of such dual horizon fluid in our scenario,
which isotropically saturates the Kovtun-Son-Starinet (KSS) bound, is
independent of both the dilaton field and axion field in that limit.Comment: 13 pages,no figures; v2: 15 page, Equation.(33), some discussions and
references added, minor corrections , Version accepted for publication in
Physics Letters
A new potential radiosensitizer: ammonium persulfate modified WCNTs
Radiotherapy plays a very important role in cancer treatment. Radiosensitizers have been widely used to enhance the radiosensitivity of cancer cells at given radiations. Here we fabricate multi-walled carbon nanotubes with ammonium persulfate, and get very short samples with 30-50 nanometer length. Cell viability assay show that f-WCNTs induce cell death significantly. We hypothesize that free radicals originated from hydroxyl and carbonyl groups on the surface of f-WCNTs lead cell damage
Tunable Quantum Beam Splitters for Coherent Manipulation of a Solid-State Tripartite Qubit System
Coherent control of quantum states is at the heart of implementing
solid-state quantum processors and testing quantum mechanics at the macroscopic
level. Despite significant progress made in recent years in controlling single-
and bi-partite quantum systems, coherent control of quantum wave function in
multipartite systems involving artificial solid-state qubits has been hampered
due to the relatively short decoherence time and lacking of precise control
methods. Here we report the creation and coherent manipulation of quantum
states in a tripartite quantum system, which is formed by a superconducting
qubit coupled to two microscopic two-level systems (TLSs). The avoided
crossings in the system's energy-level spectrum due to the qubit-TLS
interaction act as tunable quantum beam splitters of wave functions. Our result
shows that the Landau-Zener-St\"{u}ckelberg interference has great potential in
the precise control of the quantum states in the tripartite system.Comment: 24 pages, 3 figure
Remote information concentration and multipartite entanglement in multilevel systems
Remote information concentration (RIC) in -level systems (qudits) is
studied. It is shown that the quantum information initially distributed in
three spatially separated qudits can be remotely and deterministically
concentrated to a single qudit via an entangled channel without performing any
global operations. The entangled channel can be different types of genuine
multipartite pure entangled states which are inequivalent under local
operations and classical communication. The entangled channel can also be a
mixed entangled state, even a bound entangled state which has a similar form to
the Smolin state, but has different features from the Smolin state. A common
feature of all these pure and mixed entangled states is found, i.e., they have
common commuting stabilizers. The differences of qudit-RIC and qubit-RIC
() are also analyzed.Comment: 10 pages, 3 figure
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