4,148 research outputs found
Hardy's paradox and violation of a state-independent Bell inequality in time
Tests such as Bell's inequality and Hardy's paradox show that joint
probabilities and correlations between distant particles in quantum mechanics
are inconsistent with local realistic theories. Here we experimentally
demonstrate these concepts in the time domain, using a photonic entangling gate
to perform nondestructive measurements on a single photon at different times.
We show that Hardy's paradox is much stronger in time and demonstrate the
violation of a temporal Bell inequality independent of the quantum state,
including for fully mixed states.Comment: Published Version, 4 pages, 3 figures. New, more boring titl
Practical trapped-ion protocols for universal qudit-based quantum computing
The notion of universal quantum computation can be generalized to multi-level
qudits, which offer advantages in resource usage and algorithmic efficiencies.
Trapped ions, which are pristine and well-controlled quantum systems, offer an
ideal platform to develop qudit-based quantum information processing. Previous
work has not fully explored the practicality of implementing trapped-ion qudits
accounting for known experimental error sources. Here, we describe a universal
set of protocols for state preparation, single-qudit gates, a new
generalization of the M\o{}lmer-S\o{}rensen gate for two-qudit gates, and a
measurement scheme which utilizes shelving to a meta-stable state. We
numerically simulate known sources of error from previous trapped ion
experiments, and show that there are no fundamental limitations to achieving
fidelities above for three-level qudits encoded in
ions. Our methods are extensible to higher-dimensional
qudits, and our measurement and single-qudit gate protocols can achieve
fidelities for five-level qudits. We identify avenues to further
decrease errors in future work. Our results suggest that three-level trapped
ion qudits will be a useful technology for quantum information processing
Entanglement-free certification of entangling gates
Not all quantum protocols require entanglement to outperform their classical
alternatives. The nonclassical correlations that lead to this quantum advantage
are conjectured to be captured by quantum discord. Here we demonstrate that
discord can be explicitly used as a resource: certifying untrusted entangling
gates without generating entanglement at any stage. We implement our protocol
in the single-photon regime, and show its success in the presence of high
levels of noise and imperfect gate operations. Our technique offers a practical
method for benchmarking entangling gates in physical architectures in which
only highly-mixed states are available.Comment: 5 pages, 2 figure
Tactical Decision-Making: Community Organizers Describe Ethical Considerations in Social Action Campaigns
Social work curriculum on social action-oriented organizing methods is often devoid of content on the day-to-day role of the organizer in recruiting diverse participants, facilitating group decision-making, and planning and implementing campaigns. Little attention is paid to how tactical decisions are made and how the ethical implications of these decisions are weighed. In this study, professional organizers were interviewed about how they viewed their work, their relationships with their constituents, and the values and ethical principles used to make tactical decisions
Polymerisable octahedral rhenium cluster complexes as precursors for photo/electroluminescent polymers
New polymerisable photoluminescent octahedral rhenium cluster complexes trans-[{Re₆Q₈}(TBP)₄VB)₂] (Q = S or Se; TBP – p-tert-butylpyridine; VB – vinyl benzoate) have been synthesised, characterised and used to construct rhe-nium cluster-organic polymer hybrid materials. These novel polymer systems are solution-processable and the rhenium clusters retain their photoluminescent properties within the polymer environment. Notably, when the rhenium cluster complexes are incorporated into the matrix of the electroluminescent polymer poly(N-vinylcarbazole), the resultant cluster polymer hybrid combined properties of both components and was used successfully in the construc-tion of a polymer light emitting diode (PLED). These prototype devices are the first PLEDs to incorporate octahedral rhenium clusters and provide the first direct evidence of the electroluminescent properties of rhenium clusters and indeed, to the best of our knowledge, of any member of the family of 24-electron hexanuclear cluster complexes of molybdenum, tungsten or rhenium
Testing of Candidate Rigid Heatshield Materials at LHMEL for the Entry, Descent, and Landing Technology Development Project
The material testing results described in this paper were part of a material development program of vendor-supplied, proposed heat shield materials. The goal of this program was to develop low density, rigid material systems with an appreciable weight savings over phenolic-impregnated carbon ablator (PICA) while improving material response performance. New technologies, such as PICA-like materials in honeycomb or materials with variable density through-the-thickness were tested. The material testing took place at the Wright-Patterson Air Force Base Laser Hardened Materials Laboratory (LHMEL) using a 10.6 micron CO2 laser operating with the test articles immersed in a nitrogen-gas environment at 1 atmosphere pressure. Test measurements included thermocouple readings of in-depth temperatures, pyrometer readings of surface temperatures, weight scale readings of mass loss, and sectioned-sample readings of char depth. Two laser exposures were applied. The first exposure was at an irradiance of 450 W/cm2 for 50 or 60 seconds to simulate an aerocapture maneuver. The second laser exposure was at an irradiance of 115 W/cm2 for 100 seconds to simulate a planetary entry. Results from Rounds 1 and 2 of these screening tests are summarized
ENHANCING PERCID STOCKING SUCCESS BY UNDERSTANDING AGE-0 PISCIVORE–PREY INTERACTIONS IN RESERVOIRS
Development of analgesic peptide therapeutics for AIDS-related neuropathic pain
poster abstractChronic neuropathic pain is a huge problem to the health and well-being of an increasingly ageing population in the US, as substantiated by the large unmet clinical need associated with this type of pain, with estimates of 30-50% of sufferers refractory to existing medication. Thus, there is an imperative to increase knowledge of mechanisms of action of the key proteins in nociceptive pathways in vitro and to extend this knowledge to in vivo models of neuropathy to advance therapeutic development in this area. N-type voltage-gated Ca2+ channels (CaV2.2) have emerged as potential novel targets for the treatment of chronic neuropathic pain. Funded, in part, by a FORCES grant, we have identified two novel derivatives of the parent 15 amino acid CBD3 peptide, derived from collapsin response mediator protein 2 (CRMP-2) that suppressed inflammatory and neuropathic hypersensitivity by inhibiting CRMP-2 binding to N-type voltage gated calcium channels (CaV2.2) [Brittain et al., Nature Medicine 17:822-829 (2011)]. Pharmacokinetic studies revealed nanogram levels of peptide in plasma of rats systemic administration consistent with relief of hypersensitivity. Furthermore, we observed improved and broader efficacy of the derivatized peptides in AIDS-therapy and nerve-injury related neuropathic pain models. Future studies regarding dosing and route of delivery optimization as well as identification of peptide-mimetics are ongoing to fully realize the commercial value of the peptides. Supported by the Startup program at the Indiana University Research & Technology Corporation (IURTC), we have setup Sophia Therapeutics LLC and together with IURTC are committed to the work proposed here
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