/ 04 09 21 6 v 1 3 0 Se p 20 04 Stairway Quantum Computer

ar X iv : h ep - t h / 04 09 16 7 v 1 1 6 Se p 20 04 Quantum Gravity Scenario of Inflation based on the CMB Anisotropies 1

Inflationary scenario based on a renormalizable model of conformal gravity is proposed and primordial spectrum is derived. The sharp fall off of the angular power spectra at low multipoles in the COBE and WMAP observations are explained by a dynamical scale of quantum gravity. At this scale, the universe would make a sharp transition from the quantum spacetime with conformal invariance to the c...

ar X iv : q ua nt - p h / 04 09 18 4 v 1 2 7 Se p 20 04 Sets of Mutually Unbiased Bases as Arcs in Finite Projective Planes ?

This note is a short elaboration of the conjecture of Saniga et al (J. Opt. B: Quantum Semiclass. 6 (2004) L19-L20) by regarding a set of mutually unbiased bases (MUBs) in a d-dimensional Hilbert space, d being a power of a prime, as an analogue of an arc in a (Desarguesian) projective plane of order d. Complete sets of MUBs thus correspond to (d+1)-arcs, i.e., ovals. The existence of two princ...

ep - p h / 04 02 21 6 v 1 2 0 Fe b 20 04 Spin observables in the NN → Y Θ + reaction at the threshold and quantum numbers of the Θ + pentaquark

ar X iv : h ep - p h / 04 09 35 4 v 1 3 0 Se p 20 04 Hadron structure from γ ∗ p scattering : interpreting hadronic matrix elements

Abstract. Hadron structure from high-Q2 γ∗ p scattering processes is often expressed in terms of hadronic matrix elements of nonlocal operators. Properly defining and interpreting these quantities is very important in light of experiments aiming to extract transverse momentum dependent parton distributions or generalized parton distributions. The current status will be reviewed, including recen...

09 04 1 v 3 1 4 Se p 20 00 Entangled Rings

Consider a ring of N qubits in a translationally invariant quantum state. We ask to what extent each pair of nearest neighbors can be entangled. Under certain assumptions about the form of the state, we find a formula for the maximum possible nearest-neighbor entanglement. We then compare this maximum with the entanglement achieved by the ground state of an antiferromagnetic ring consisting of ...