Communication Dans Un Congrès Année : 2025

Engineering of diamond growth for quantum applications

Résumé

The development of applications in quantum sensing requires dedicated solid-state material platforms with unprecedented control over quality, purity and doping. Indeed, Quantum Technologies explore our ability to coherently control the peculiar properties of nanoscale quantum systems and harness their potential in a wide range of fields including health, communications, security and environment. Atomic-scale defects in solid-state materials are among the most promising candidates and several platforms are being considered such as donors in silicon, color centers in semiconductors, rare-earth ions in oxides, quantum dots etc. One of the inherent drawbacks of the extreme sensitivity of such spin systems to the field they are supposed to measure, is the necessity to carefully control their close crystalline environment in order to maximize coherence properties which pushes the fabrication technologies to their limits. In this presentation, we will review the main challenges in the synthesis of suitable “quantum-grade” diamond materials using color centers and more specifically NV centers. Issues related to the control of their density and the maximization of their coherence properties through precise engineering of the growth process will be discussed. (i) Atomic scale defects need to be introduced on demand within diamond. High amounts are usually preferred in most sensing schemes but limits exist in the ability to control growth at high doping levels as well as to avoid interaction between nearby spins. (ii) Nuclear spins within the matrix itself might cause decoherence and growth of isotopically enriched materials allows considerably extending T2 times. (iii) In a similar way, magnetic sensitivity of a sensor based on NV ensembles can be considerably increased by producing diamond with NV centers having preferential orientation which can be obtained by using diamond substrates with specific crystallographic orientation (iv) Controlling the spatial localization of color centers is crucial to the sensing device since their interaction strongly depends on the distance to the field that is to be sensed. (v) Controlling the shape and the size of the diamond platform remains also a very challenging point.

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Dates et versions

hal-05025618 , version 1 (08-04-2025)

Identifiants

  • HAL Id : hal-05025618 , version 1

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Jocelyn Achard, Alexandre Tallaire, Ovidiu Brinza, Vianney Mille, Fabien J Bénédic. Engineering of diamond growth for quantum applications. Epiparade, Apr 2025, Grenoble, France. ⟨hal-05025618⟩
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