Who We Are
Novel solutions to old problems
Tegri LLC focuses its attention on the all-electrically tunable clusters and arrays of the graphene quantum dots (GQD) serving as a promising framework for novel solid-state devices. Examples of such devices are solid-state quantum computers, THz spectral analyzers, and lasers. The basic concept utilizes recent progress in nanoscience, solid-state physics, electronics, and chemistry, by offering novel opportunities for a new generation of technological solutions.
Recent publications
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S. E. Shafraniuk, Tunable spectral narrowing enabling the functionality of graphene qubit circuits at room temperature, Phys. Rev. B 107, 045415 (2023).
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S. E. Shafraniuk, Graphene quantum dot crystal serving as a multi-qubit circuit operating at high temperatures, Adv. Quantum Technol. 3, 2000062 (2020).
3. S. E. Shafraniuk, Unconventional electromagnetic properties of the graphene quantum dots, Phys. Rev. B 100, 075404 (2019).
The GQD devices exploit the phenomenon of intrinsic spectral narrowing (ISN) causing prolongation of the relaxation time of electrons residing on the quantized level by 4-6 orders of magnitude. The ISN phenomenon also improves the quantum coherence of the GQD device resulting in a considerable increase in decoherence and dephasing times. Furthermore, ISN ensures the improved functionality of the THz lasers and spectral analyzers by using the two mechanisms: (i) the Rabi splitting of the narrowed energy levels induced by the ac Stark effect and (ii) the strong non-equilibrium effects caused by the prolonged relaxation time. The potential advantages of the proposed technology include (a) the NEP decrease by 2-4 orders of magnitude in THz sensors, (b) ten times shorter response time, (d) the 90% reduction of intrinsic energy dissipation, and (d) the all-electrical control.
Advanced Solutions
The impressive commercial potential of GQD arises from their promising high performance, all-electrical tunability, nanoscale portability, and functionality not requiring coercive cooling. In particular, the GQD-based THz spectral analyzers are characterized by high fidelity, reduced noise equivalent power (NEP), response time, portability, and independence on the temperature. The market value of the GQD-based quantum computing circuits and THz devices is improved due to their functionality at room temperature.