The QES Signal Amplification Mechanism

QES Sensing Paradigm demonstration
QES Sensing Paradigm demonstration

Electronic Feedback Amplification

Seminal paper that describes the concepts of the electronic feedback mechanism that enables amplification of vibrational signal over the thermal background.

This mechanisms enables the practice of QES at room temperature unlike IETS that required vacuum and cryogenic temperatures.

Journal of Applied Physics

Active control of probability amplitudes in a mesoscale system via feedback-induced suppression of dissipation and noise.

We demonstrate that a three-terminal potentiostat circuit reduces the coupling between an electronic excitation transfer (EET) system and its environment, by applying a low-noise voltage to its electrical terminals. Inter-state interference is preserved in the EET system by attenuating the dissipation in the quantum system arising from coupling to the surrounding thermodynamic bath. A classical equivalent circuit is introduced to model the environment-coupled excitation transfer for a simplified, two-state system. This model provides a qualitative insight into how the electronic feedback affects the transition probabilities and selectively reduces dissipative coupling for one of the participant energy levels EET system. Furthermore, we show that the negative feedback also constrains r.m.s. fluctuations of the energy of environmental vibrational states, resulting in persistent spectral coherence between the decoupled state and vibronic levels of the complementary state. The decoupled vibronic channel therefore can serve as a probe for characterizing the vibronic structure of the complementary channel of the EET system.

Chaitanya Gupta, Aldo Peña Perez, Sean R. Fischer, Stephen B. Weinreich, Boris Murmann, and Roger T. Howe

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