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Electrically-active defects have a significant impact on the performance of

electronic devices based on wide band-gap materials such as diamond. This issue

is ubiquitous in diamond science and technology, since the presence of charge

traps in the active regions of different classes of diamond-based devices

(detectors, power diodes, transistors) can significantly affect their

performances, due to the formation of space charge, memory effects and the

degradation of the electronic response associated with radiation damage. Among

Thermally stable quantum states with multipartite entanglements led by

frustration are found in the antiferromagnetic spin-1/2 Heisenberg hexagon. The

model has been solved exactly to obtain all analytic expressions of eigenvalues

and eigenfunctions. Detection and characterizations for various types of

entanglements have been carried out in terms of concurrence and entanglement

witnesses based on several thermodynamic observables. Variations of

entanglement properties with respect to temperature and frustration are

Classical mechanics, relativity, electrodynamics and quantum mechanics are

often depicted as separate realms of physics, each with its own formalism and

notion. This remains unsatisfactory with respect to the unity of nature and to

the necessary number of postulates. We uncover the intrinsic connection of

these areas of physics and describe them using a common symplectic Hamiltonian

formalism. Our approach is based on a proper distinction between variables and

We describe how to introduce dynamics for the holographic states and codes

introduced by Pastawski, Yoshida, Harlow and Preskill. This task requires the

definition of a continuous limit of the kinematical Hilbert space of a finite H

which we argue may be achieved via the semicontinuous limit of Jones. Dynamics

is then introduced by building a unitary representation of a group known as

Thompson's group T, which is closely related to the conformal group

- Read more about Dynamics for holographic codes. (arXiv:1706.08823v1 [quant-ph])
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A permutation-invariant quantum code on $N$ qudits is any subspace stabilized

by the matrix representation of the symmetric group $S_N$ as permutation

matrices that permute the underlying $N$ subsystems. When each subsystem is a

complex Euclidean space of dimension $q \ge 2$, any permutation-invariant code

is a subspace of the symmetric subspace of $(\mathbb C^q)^N.$ We give an

algebraic construction of new families of of $d$-dimensional

permutation-invariant codes on at least $(2t+1)^2(d-1)$ qudits that can also

For certain correlated electron-photon systems we construct the exact

density-to-potential maps, which are the basic ingredients of a

density-functional reformulation of coupled matter-photon problems. We do so

for numerically exactly solvable models consisting of up to four fermionic

sites coupled to a single photon mode. We show that the recently introduced

concept of the intra-system steepening (T.Dimitrov et al., 18, 083004 NJP

(2016)) can be generalized to coupled fermion-boson systems and that the

- Read more about Exact functionals for correlated electron-photon systems. (arXiv:1706.08852v1 [quant-ph])
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Theoretical achievements, as well as much controversy, surround multiverse

theory. Various types of multiverses, with an increasing amount of complexity,

were suggested and thoroughly discussed by now. While these types are very

different, they all share the same basic idea - our physical reality consists

of more than just one universe. Each universe within a possibly huge multiverse

might be slightly or even very different from the others. The quilted

multiverse is one of these types, whose uniqueness arises from the postulate

The quantum Zeno effect is the suppression of Hamiltonian evolution by

repeated observation, resulting in the pinning of the state to an eigenstate of

the measurement observable. Using measurement only, control of the state can be

achieved if the observable is slowly varied such that the state tracks the now

time-dependent eigenstate. We demonstrate this using a circuit-QED readout

technique that couples to a dynamically controllable observable of a qubit.

On the path towards quantum gravity, we find friction between temporal

relations in quantum mechanics (QM) (where they are fixed and

field-independent), and in general relativity (where they are field-dependent

and dynamic). This paper aims to attenuate that friction, by encoding gravity

in the timeless configuration space of spatial fields with dynamics given by a

path integral. The framework demands that boundary conditions for this path

integral be uniquely given, but unlike other approaches where they are

- Read more about Quantum gravity in timeless configuration space. (arXiv:1706.08875v1 [gr-qc])
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Minimal length of a two-dimensional Klein-Gordon oscillator is investigated

and illustrates the wave functions in the momentum space. The energy

eigenvalues are found and the corresponding wave functions are calculated in

terms of hyper-geometric functions.