Nonlinear signal distortion corrections through quantum sensing

Characterizing nonlinear RF circuits for their in-band signal distortion

This work presents a theoretical discussion on the ability of traditional noise power ratio (NPR) setups to characterize the in-band signal distortion of general RF circuits. It is shown that NPR tests are optimistic in estimating co-channel distortion, as they are blind for the signal-correlated components. Therefore, an alternative standard for co-channel distortion specification and the asso...

Table 2. Refraction and Distortion Corrections

Nonlinear Models in Quantum Optics through Quantum Algebras

with a, b, c being boson operators for three different modes of the radiation field, describes (under certain conditions) nonlinear quantum optical processes as frequency conversion and Raman and Brillouin scattering [1]. Through a Jordan–Schwinger transformation, this model is algebraically equivalent to the resonant interaction of a sample of two-level atoms with a single mode of the quantize...

Quantum-Enhanced Sensing Based on Time Reversal of Nonlinear Dynamics.

We experimentally demonstrate a nonlinear detection scheme exploiting time-reversal dynamics that disentangles continuous variable entangled states for feasible readout. Spin-exchange dynamics of Bose-Einstein condensates is used as the nonlinear mechanism which not only generates entangled states but can also be time reversed by controlled phase imprinting. For demonstration of a quantum-enhan...

The leading quantum corrections

I describe the treatment of gravity as a quantum effective field theory. This allows a natural separation of the (known) low energy quantum effects from the (unknown) high energy contributions. Within this framework, gravity is a well behaved quantum field theory at ordinary energies. In studying the class of quantum corrections at low energy, the dominant effects at large distance can be isola...