3 research outputs found
Contextuality and Nonlocality in Decaying Multipartite Systems
Everyday experience supports the existence of physical properties independent
of observation in strong contrast to the predictions of quantum theory. In
particular, existence of physical properties that are independent of the
measurement context is prohibited for certain quantum systems. This property is
known as contextuality. This paper studies whether the process of decay in
space-time generally destroys the ability of revealing contextuality. We find
that in the most general situation the decay property does not diminish this
ability. However, applying certain constraints due to the space-time structure
either on the time evolution of the decaying system or on the measurement
procedure, the criteria revealing contextuality become inherently dependent on
the decay property or an impossibility. In particular, we derive how the
context-revealing setup known as Bell's nonlocality tests changes for decaying
quantum systems. Our findings illustrate the interdependence between hidden and
local hidden parameter theories and the role of time.Comment: 5 pages, 2 figure
Vulnerability of "A novel protocol-authentication algorithm ruling out a man-in-the-middle attack in Quantum Cryptography"
In this paper we review and comment on "A novel protocol-authentication
algorithm ruling out a man-in-the-middle attack in quantum cryptography", [M.
Peev et al., Int. J. Quant. Inform., 3, 225, (2005)]. In particular, we point
out that the proposed primitive is not secure when used in a generic protocol,
and needs additional authenticating properties of the surrounding
quantum-cryptographic protocol.Comment: 6 page
Rheumatoid arthritis, gold therapy, contact allergy and blood cytokines
OBJECTIVE: To study the clinical and biochemical effects of a low starting dose for gold therapy in rheumatoid arthritis patients with a contact allergy to gold. METHODS: Serum cytokines were assayed before and 24 h after the first injection of gold sodium thiomalate (GSTM). RESULTS: Contact allergy to gold was found in 4 of 19 patients. Compared to gold-negative patients (starting dose: 10 mg GSTM), there was a larger increase in serum TNFalpha (p < 0.05), sTNF-R1 (NS), and IL-1 ra (p < 0.05) in gold-allergic patients. CONCLUSIONS: Cytokines are released in blood by GSTM in RA patients with gold allergy. To minimize the risk of acute adverse reactions the starting dose of GSTM should be lowered to 5 mg. Alternatively, patients should be patch-tested before gold therapy; in test-positive cases, 5 mg is recommended as the first dose