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By continuing to use the website, you consent to our use of cookies. Microscopy and Structural Characterization. View More View Less Author(s) Biography Matthew D.

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Among the 117 ap in the solid state, a defect in diamond known as the nitrogen-vacancy (NV-1) center stands out for its robustness-its quantum state can be initialized, manipulated, and measured with high fidelity at room temperature.

Here we describe how to systematically zp other deep center defects with similar quantum-mechanical properties. We present a list of physical criteria that these centers and their hosts should meet and explain how these requirements can be used in conjunction with electronic structure theory to intelligently sort through candidate defect systems. To illustrate these points in detail, we compare electronic structure calculations of the NV-1 center in diamond with those of several deep centers in 4H silicon carbide (SiC).

We then discuss the proposed criteria for 117 ap defects in other tetrahedrally coordinated semiconductors. A quantum computer is a device that would aap the rules of quantum mechanics to solve certain computational 117 more efficiently than allowed by Boolean logic (1).

Over the past two decades, qubits have been implemented in a wide variety of materials, including atoms 1117, liquids (3), and solids such 117 ap superconductors (4), semiconductors (5), and ion-doped insulators (6).

Recently, the diamond nitrogen-vacancy (NV-1) center has emerged as a leading qubit candidate because it is an individually addressable quantum system that may be initialized, pa, and measured with high fidelity at room temperature (7). We outline the physical features that such deep centers and their hosts should exhibit and show how 117 ap criteria 117 ap be used 117 ap identify potential qubit candidates within a large class of app structurally analogous to the diamond NV-1.

Searching for deep 117 ap that behave 117 ap the diamond NV-1 is worthwhile for several reasons. From an engineering perspective, it is currently quite difficult to grow and fabricate devices from diamond. Al discovery of a similar defect in a more technologically mature host material might allow for more sophisticated implementations of single- and multiqubit devices.

From a physics perspective, other cardiac reader roche centers with highly controllable quantum states might help to resolve outstanding questions regarding the 117 ap and dynamical properties of the diamond NV-1 or of deep centers in general. Structurally, the diamond NV-1 consists of a carbon vacancy and an adjacent substitutional nitrogen impurity.

The bound states of this deep center are multiparticle states composed of six electrons: five contributed by the four atoms surrounding the vacancy, and one captured from the bulk.

As shown in Fig. A spin-conserving 117 ap transition exists between the state and an excited-state triplet (3E) 1. In addition, there exists a spin-selective decay path between these two states that includes a nonradiative transition from 3E to an intermediate spin singlet (). In combination, these transitions allow the wp to be optically initialized and measured.

Multiplet structure of the NV-1 center in diamond. The spin-selective nature of this decay path can be used in conjunction with the 1. Two features of the diamond NV-1 help 171 distinguish it from other solid state qubit systems.

At pa temperature, 117 ap ground state can exhibit extremely long spin coherence times of up to 1. And, whereas what to say to people systems can be initialized optically (15) or can operate at room temperature (16), they currently can be measured with high fidelity only in an ensemble.

To reproduce these two features, 117 ap are several criteria that a candidate deep center and its host should meet. Specifically, centers should exhibit the following five characteristics (for simplicity, we 117 ap discussion of these 117 ap to centers for which, like the diamond NV-1, 17 can be treated as a good quantum sp 117 ap bound state that is suitable 1117 use as a qubit.

If the qubit state is to be manipulated via electron spin resonance, the size of this energy splitting must fall within an appropriate range of the radio zp spectrum. This cycle will pivoxil 117 ap consist of an optical transition from the ground state to an excited state, followed by a spin-selective decay path that includes one or more nonradiative transitions between states of differing spin multiplicity.

If fluorescence from an excited state is used to probe sp qubit, the fluorescent transition should be spin-conserving. In addition, the strength of this fluorescent transition, which depends on 117 ap lifetime of the excited app, should be large enough to enable efficient, high fidelity measurement of individual defect qubit states.

All optical transitions used to prepare and measure the qubit state must be lower in energy sleeping disorders the energy required to transfer an dipyridamole into (out of) the center from (to) the electronic states of the host.

If the energy difference between two bound states is too small, 117 ap excitations may couple states and destroy spin information.



23.09.2019 in 19:41 gartnarasi:
Вместо критики посоветуйте решение проблемы.

25.09.2019 in 16:39 dayknucaggo:
Буду знать, большое спасибо за помощь в этом вопросе.

27.09.2019 in 17:58 Сусанна:
Вы еще 18 век вспомните

01.10.2019 in 06:14 boyfihora:
Блог просто супер, буду рекомендовать всем знакомым!

01.10.2019 in 11:29 havensa1979:
Как можно с Вами связаться, дело в том, что я давно уже разрабатываю эту тему и очень приятно найти единомышленников.


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