Room-Temperature Defect Qubits in Ultrasmall Nanocrystals

Beke, Dávid and Valenta, Jan and Károlyházy, Gyula and Lenk, Sándor and Czigány, Zsolt and Márkus, Bence Gábor and Kamarás, Katalin and Simon, Ferenc and Gali, Ádám (2020) Room-Temperature Defect Qubits in Ultrasmall Nanocrystals. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 11. pp. 1675-1681. ISSN 1948-7185

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Abstract

There is an urgent quest for room-temperature qubits in nanometer-sized, ultrasmall nanocrystals for quantum biosensing, hyperpolarization of biomolecules, and quantum information processing. Thus far, the preparation of such qubits at the nanoscale has remained futile. Here, we present a synthesis method that avoids any interaction of the solid with high-energy particles and uses self-propagated high-temperature synthesis with a subsequent electrochemical method, the no-photon exciton generation chemistry to produce room-temperature qubits in ultrasmall nanocrystals of sizes down to 3 nm with high yield. We first create the host silicon carbide (SiC) crystallites by high-temperature synthesis and thenapply wet chemical etching, which results in ultrasmall SiC nanocrystals and facilitates the creation of thermally stable defect qubits in the material. We demonstrate room-temperature optically detected magnetic resonance signal of divacancy qubits with 3.5% contrast from these nanoparticles with emission wavelengths falling in the second biological window (1000− 1380 nm). These results constitute the formation of nonperturbative bioagents for quantum sensing and efficient hyperpolarization.

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