Experimental Hamiltonian identification for controlled two-level systems

We present a strategy to empirically determine the internal and control Hamiltonians for an unknown two-level system (black box) subject to various (piecewise constant) control fields when direct readout by measurement is limited to a single, fixed observable

Controlled phase gate for solid-state charge qubits

We describe a mechanism for realizing a controlled phase gate for solid-state charge qubits. By augmenting the positionally defined qubit with an auxiliary state, and changing the charge distribution in the three-dot system, we are able to effectively switch the Coulombic interaction, effecting an entangling gate. We consider two architectures, and numerically investigate their robustness to gate noise.Comment: 14 pages, 11 figures, 2 tables, RevTeX

Drug therapy and disease management: An opinion

The Impact of Memantine and One-­on-One Caregiver Contact on Antipsychotic Medication Prescribed to Elderly Veterans with Dementia: Potential Global Care Strateg

Direct estimation of functionals of density operators by local operations and classical communication

We present a method of direct estimation of important properties of a shared bipartite quantum state, within the "distant laboratories" paradigm, using only local operations and classical communication. We apply this procedure to spectrum estimation of shared states, and locally implementable structural physical approximations to incompletely positive maps. This procedure can also be applied to the estimation of channel capacity and measures of entanglement

Interference of Quantum Channels

We show how interferometry can be used to characterise certain aspects of general quantum processes, in particular, the coherence of completely positive maps. We derive a measure of coherent fidelity, maximum interference visibility and the closest unitary operator to a given physical process under this measure.Comment: 4 pages, 5 figures, REVTeX 4, typographical corrections and added acknowledgemen

Cranked Hartree-Fock-Bogoliubov Calculation for Rotating Bose-Einstein Condensates

A rotating bosonic many-body system in a harmonic trap is studied with the 3D-Cranked Hartree-Fock-Bogoliubov method at zero temperature, which has been applied to nuclear many-body systems at high spin. This method is a variational method extended from the Hartree-Fock theory, which can treat the pairing correlations in a self-consistent manner. An advantage of this method is that a finite-range interaction between constituent particles can be used in the calculation, unlike the original Gross-Pitaevskii approach. To demonstrate the validity of our method, we present a calculation for a toy model, that is, a rotating system of ten bosonic particles interacting through the repulsive quadrupole-quadrupole interaction in a harmonic trap. It is found that the yrast states, the lowest-energy states for the given total angular momentum, does not correspond to the Bose-Einstein condensate, except a few special cases. One of such cases is a vortex state, which appears when the total angular momentum $L$ is twice the particle number $N$ (i.e., $L=2N$).Comment: accepted to Phys. Rev.

Band Crossing studied by GCM with 3D-CHFB

We solved the constrained Hill-Wheeler Equation, and found several signatures of multi-band crossing in 182 Os.Comment: LaTeX 3 pages, 3 eps figures; Contribution to International Conference, Nuclear Structure at the extreme,Lewes, UK, (1998) Jun.17-1

REVIEW: Lupus nephritis: An approach to diagnosis and treatment in South Africa

Lupus nephritis (LN) is a significant cause of morbidity and mortality in patients with systemic lupus  erythematosus. Delayed recognition and diagnosis of LN may be a common cause of chronic kidney disease among South Africans. Renal biopsy is the gold standard of diagnosing LN; however, this service is not  available in many centres and the use of urinalysis, urine microscopic examination and other serological tests can be useful in identifying patients with proliferative LN. Proliferative types of LN (class III, class IV and  mixed class V) comprise the larger proportion of patients with this condition. Patients receiving  immunosuppressive therapy need to be monitored closely for side-effects and drug-related toxicities. LN patients with end-stage renal disease (class VI) need to be prepared for renal replacement therapy (dialysis  and renal transplantation). In all patients, treatment should include adjunctive therapies such as renin  angiotensin aldosterone system blockade, bone protection (with calcium supplements and vitamin D), blood  pressure control and chloroquine – all of which help to retard the progression of kidney disease