13 papers
Which pulse maximizes resonant nonlinear conversion?
Alex Krasnok
At fixed pulse energy, which drive waveform extracts the most th-order nonlinear conversion from a resonator ( for second harmonic)? A short pulse couples poorly to a narro…
Protecting Qubits from Purcell Decay via Permanent Dipoles
Alex Krasnok
Reading out a qubit often requires coupling it to a resonator, but that same resonator can also give the qubit an extra path to decay. Here, we study a way to reduce this loss usin…
From False Roots to Phasors: Negative and Complex Numbers in Mathematics, Physics, and Electrical Engineering
Alex Krasnok
Negative and complex numbers are so familiar in modern mathematics, physics, and engineering that it is easy to forget how uncertain their status once was. They did not become esta…
Trajectory probing of complex-frequency scattering with chirped analytic pulses
Alex Krasnok, Denis Seletskiy
Characterizing resonant scatterers is challenging because their poles and zeros usually lie away from the real-frequency axis, whereas most measurements sample only real frequencie…
Advanced Superdirective Antennas
Alex Krasnok
Superdirective (supergain) antennas aim to produce a narrow main beam from radiators that are electrically small compared with the wavelength. Instead of enlarging the physical ape…
Purcell-Like Environmental Enhancement of Classical Antennas: Self and Transfer Effects
Alex Krasnok
Environmental 'range boosts' in wireless links are often explained through radiation-pattern intuition, yet the underlying physics is more cleanly captured by two environment-contr…