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We propose an efficient method for the enhancement of below-threshold harmonic generation (BTHG) by mid-infrared laser-driven excited states of a Cs atom. The BTHG is calculated by solving three-dimensional time-dependent Schrödinger equation accurately and efficiently using the time-dependent generalized pseudospectral method. We adopt an excited state as the initial state of a Cs atom. As a result,...
In this paper, we design a super-stable optical interferometer with multi-pass to estimate an unknown phase by using single photon, two-entangled photons, four-entangled photons and distinguishable four-photons. By jointing photon counting measurements, we find that these schemes enable us to estimate an unknown phase with a considerable high precision and beat the standard quantum limit under a certain...
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