Superconductivity mediated by spin fluctuations in weak and nearly ferromagnetic metals is studied close to the zero-temperature magnetic transition. We solve analytically the Eliashberg equationsâ€¦ (More)

A quantum computer has been expected to outperform its classical counterpart in some computation problems. For example, the well-known Shorâ€™s factoring algorithm[1] and Groverâ€™s algorithm[2]â€¦ (More)

Date The final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentionedâ€¦ (More)

A quantum computer has been expected to outperform its classical counterpart in some computation problems. For example, the well-known Shorâ€™s factoring algorithm[1] and Groverâ€™s algorithm[2]â€¦ (More)

Using the Majorana fermion representation of spin-1/2 local moments, we show how the dynamic spin correlation and susceptibility are obtained directly from the one-particle Majorana propagator. Weâ€¦ (More)

We develop a theory of quadratic quantum measurements by a mesoscopic detector. It is shown that the quadratic measurements should have nontrivial quantum information properties, providing, forâ€¦ (More)