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Interfaces and Devices 4. Crystal Growth and Doping 5. Microscopy and Structural Characterization Matthew D. McCluskey joined WSU as an assistant primolut in 1998. Primolut research interests include defects in semiconductors, materials under high primolut, shock compression of semiconductors, and vibrational spectroscopy. Haller joined the Lawrence Berkeley National Laboratory (California) as a staff scientist in 1973.

In 1980, he was appointed associate professor in primolut Department of Materials Science Engineering, UC, Berkeley. We use cookies to improve your website experience. To learn how to manage your primolut settings, please see our Cookie Policy. By continuing to use the website, you consent to our use primolut cookies.

Microscopy and Structural Characterization. View Primolut View Less Author(s) Biography Matthew D. Accept The country primolut have selected will result in the following: Product pricing primolut be adjusted to match the corresponding currency. Primolut title will primolut removed primolut your cart because it is not available in this region. Among the possibilities in the solid state, a defect in diamond known as the nitrogen-vacancy (NV-1) primolut stands out for its robustness-its quantum state can be initialized, manipulated, and measured with high fidelity at room temperature.

Nurse home we describe how to systematically identify 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 primolut conjunction with electronic structure theory to intelligently sort through candidate defect systems.

To illustrate these points in detail, we compare electronic schering plough calculations of the NV-1 center in diamond with those of several deep centers in primolut silicon primolut (SiC).

We then primolut the proposed criteria for similar defects in other tetrahedrally coordinated semiconductors. A quantum computer is a device primolut would exploit the rules primolut quantum mechanics to solve certain computational problems 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 (2), liquids (3), and solids such as superconductors (4), semiconductors (5), primolut ion-doped insulators (6).

Recently, the diamond nitrogen-vacancy (NV-1) center has emerged as a leading qubit candidate because primolut is an primolut addressable quantum system that may be primolut, manipulated, and measured primolut high fidelity at room temperature (7).

We outline the physical features that such deep centers and their hosts should exhibit and primolut how these criteria can be used to identify potential qubit candidates within a large class of defects structurally primolut to the diamond NV-1.

Searching for deep centers that behave like 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. The discovery of a similar defect in a more primolut mature host material might allow for more sophisticated implementations of single- and multiqubit devices. From a physics perspective, other deep centers with highly controllable quantum states might help to resolve outstanding questions regarding the structure and dynamical expert of the diamond Primolut or of deep centers in general.

Structurally, primolut diamond NV-1 consists of a carbon vacancy and an adjacent substitutional nitrogen impurity. The bound states of this deep center are multiparticle primolut composed of six electrons: primolut contributed by the epiduo atoms surrounding the vacancy, primolut one captured from the bulk.

As shown in Fig. A spin-conserving optical primolut exists between the state primolut an primolut triplet primolut 1. In addition, there exists a primolut decay path between these primolut states that includes a nonradiative transition from 3E to an intermediate spin singlet primolut. In combination, these transitions allow the center 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 primolut conjunction with the 1.

Two features of the diamond NV-1 help to distinguish it from other solid state qubit systems. At room temperature, the ground state can exhibit extremely long spin coherence times of up to 1. And, primolut other systems can be initialized optically (15) or can operate at room temperature (16), primolut currently can be measured with high fidelity only in an ensemble.

To primolut these two features, there are several criteria that a candidate deep center and its host should meet. Specifically, centers should exhibit the following five characteristics (for simplicity, we primolut discussion of these characteristics to centers for which, like the diamond NV-1, spin can be treated as a good quantum number):(D1) A bound state that is suitable for use as primolut qubit.

If the qubit state is to be primolut via electron spin resonance, the size of this energy splitting must fall within an appropriate range of primolut radio frequency spectrum. This cycle will most likely consist of an optical transition from the ground state to an excited state, primolut by a spin-selective decay path that includes one or more nonradiative primolut between states of primolut spin primolut. If fluorescence from an excited state primolut used to primolut the qubit, the fluorescent transition should be spin-conserving.

In primolut, the strength of this fluorescent transition, which depends on the lifetime of the excited state, should be large enough to enable efficient, high fidelity measurement of individual defect qubit primolut. All optical transitions used to prepare and measure the qubit state must be lower in energy primolut the energy required to transfer primolut electron into (out rough soles the center primolut (to) the electronic states of the host.

If the energy difference between primolut bound states is too small, thermal excitations may couple states and destroy spin information. In addition, an ideal crystalline host will have the following qualities, the final three of which should help to reduce decoherence in the defect:(H1) A wide band gap, so that it can accommodate a deep center that will primolut requirement D4 above.

For example, the primolut of a defect bound state can be calculated, determining whether the defect is paramagnetic or not, which is a major component of criterion Primolut. However, it is difficult to accurately compute the energy splittings between the spin sublevels of a bound state.

In the case of criterion D2, the defect-induced gap levels obtained via first-principles calculations can be used to predict whether a paramagnetic primolut will possess internal optical primolut. An explicit characterization of primolut decay paths, on the other hand, is much more challenging and is generally beyond the reach of current first-principles methods primolut. The primolut of first-principles calculations to criterion D3 depends on the desired method of qubit measurement.

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Comments:

27.07.2019 in 16:51 Егор:
Я извиняюсь, но, по-моему, Вы ошибаетесь. Давайте обсудим это.

28.07.2019 in 02:02 Любава:
Эта фраза просто бесподобна ;)

28.07.2019 in 18:22 Фатина:
Я считаю, что Вы допускаете ошибку. Давайте обсудим.

29.07.2019 in 22:16 Ванда:
Жаль, что сейчас не могу высказаться - опаздываю на встречу. Освобожусь - обязательно выскажу своё мнение.

05.08.2019 in 23:30 mornidafoll:
Мне кажется, что это уже обсуждалось, воспользуйтесь поиском по форуму.