[Review of] David G. Such. Avant-Garde Jazz Musicians: Performing Out There

The burgeoning scholarship on the avant-garde in jazz of the 1950s and 1960s still accounts for only a small number of scholarly jazz-related publications. Though the ascendance of interdisciplinary, cultural studies paradigms leave open many pathways to discussions of avant-garde jazz, David G. Such\u27s Avant-Garde Jazz Musicians incorporates little ofthe cultural criticism Ronald Radano offers in his equally new New Musical Figurations: Anthony Braxton’s Cultural Critique (Chicago: University of Chicago Press, 1993). Such instead focuses multiply on what avant-garde musicians say about their music\u27s position a handful of topical devices which head chapters in the text. From considering Labels, an indispensable issue in music criticism -- since so much knowledge is vested in its nominal category -- Such discusses predecessors to the ”out jazz“ period from the mid-late 1950s onward, citing bebop\u27s revolutionary reputation and its figureheads as worthy precursors to such musicians as Cecil Taylor, Ornette Coleman, and many of the more recent player/composers whom Such interviews

Optical spin-1 chain and its use as a quantum computational wire

Measurement-based quantum computing, a powerful alternative to the standard circuit model, proceeds using only local adaptive measurements on a highly-entangled resource state of many spins on a graph or lattice. Along with the canonical cluster state, the valence-bond solid ground state on a chain of spin-1 particles, studied by Affleck, Kennedy, Lieb, and Tasaki (AKLT), is such a resource state. We propose a simulation of this AKLT state using linear optics, wherein we can make use of the high-fidelity projective measurements that are commonplace in quantum optical experiments, and describe how quantum logic gates can be performed on this chain. In our proposed implementation, the spin-1 particles comprizing the AKLT state are encoded on polarization biphotons: three level systems consisting of pairs of polarized photons in the same spatio-temporal mode. A logical qubit encoded on the photonic AKLT state can be initialized, read out and have an arbitrary single qubit unitary applied to it by performing projective measurements on the constituent biphotons. For MBQC, biphoton measurements are required which cannot be deterministically performed using only linear optics and photodetection.Comment: 9 pages, 4 figures, published versio

No more adoption rates! Looking for empowerment in agricultural development programmes

The Plant Protection Department has responded to these developments by organising workshops for Farmer Trainers. This has led to further initiatives by IPM farmers. Mr Neupane and Mrs Bimauli are now members of the Jhapa IPM Association, an organisation that is run by farmers and which is linking up with similar associations in other Districts. The association in Jhapa plans and organises its own training activities, and negotiates the support required from the Department of Agriculture and Local Government Units

Tomography of a spin qubit in a double quantum dot

We investigate a range of methods to perform tomography in a solid-state qubit device, for which a priori initialization and measurement of the qubit is restricted to a single basis of the Bloch sphere. We explore and compare several methods to acquire precise descriptions of additional states and measurements, quantifying both stochastic and systematic errors, ultimately leading to a tomographically-complete set that can be subsequently used in process tomography. We focus in detail on the example of a spin qubit formed by the singlet-triplet subspace of two electron spins in a GaAs double quantum dot, although our approach is quite general.Comment: 10 pages, 5 figures, comments welcome; v2 published versio

Perturbative 2-body Parent Hamiltonians for Projected Entangled Pair States

We construct parent Hamiltonians involving only local 2-body interactions for a broad class of Projected Entangled Pair States (PEPS). Making use of perturbation gadget techniques, we define a perturbative Hamiltonian acting on the virtual PEPS space with a finite order low energy effective Hamiltonian that is a gapped, frustration-free parent Hamiltonian for an encoded version of a desired PEPS. For topologically ordered PEPS, the ground space of the low energy effective Hamiltonian is shown to be in the same phase as the desired state to all orders of perturbation theory. An encoded parent Hamiltonian for the double semion string net ground state is explicitly constructed as a concrete example.Comment: 26 pages, 4 figures, v2 published versio

Tensor Networks with a Twist: Anyon-permuting domain walls and defects in PEPS

We study the realization of anyon-permuting symmetries of topological phases on the lattice using tensor networks. Working on the virtual level of a projected entangled pair state, we find matrix product operators (MPOs) that realize all unitary topological symmetries for the toric and color codes. These operators act as domain walls that enact the symmetry transformation on anyons as they cross. By considering open boundary conditions for these domain wall MPOs, we show how to introduce symmetry twists and defect lines into the state.Comment: 11 pages, 6 figures, 2 appendices, v2 published versio