12,483 research outputs found
IPhone Securtity Analysis
The release of Apple’s iPhone was one of the most intensively publicized product releases in the history of mobile devices. While the iPhone wowed users with its exciting design and features, it also outraged many for not allowing installation of third party applications and for working exclusively with AT&T wireless services for the first two years. Software attacks have been developed to get around both limitations. The development of those attacks and further evaluation revealed several vulnerabilities in iPhone security. In this paper, we examine several of the attacks developed for the iPhone as a way of investigating the iPhone’s security structure. We also analyze the security holes that have been discovered and make suggestions for improving iPhone security
Spin and the Thermal Equilibrium Distribution of Wave Functions
Consider a quantum system weakly interacting with a very large but finite
system called the heat bath, and suppose that the composite is in
a pure state with participating energies between and with
small . Then, it is known that for most the reduced density
matrix of is (approximately) equal to the canonical density matrix. That
is, the reduced density matrix is universal in the sense that it depends only
on 's Hamiltonian and the temperature but not on 's Hamiltonian, on the
interaction Hamiltonian, or on the details of . It has also been pointed
out that can also be attributed a random wave function whose
probability distribution is universal in the same sense. This distribution is
known as the "Scrooge measure" or "Gaussian adjusted projected (GAP) measure";
we regard it as the thermal equilibrium distribution of wave functions. The
relevant concept of the wave function of a subsystem is known as the
"conditional wave function". In this paper, we develop analogous considerations
for particles with spin. One can either use some kind of conditional wave
function or, more naturally, the "conditional density matrix", which is in
general different from the reduced density matrix. We ask what the thermal
equilibrium distribution of the conditional density matrix is, and find the
answer that for most the conditional density matrix is (approximately)
deterministic, in fact (approximately) equal to the canonical density matrix.Comment: 13 pages, no figures; v2 minor improvement
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