Transient absorption and lasing without inversion in an artificial molecule via Josephson coupling energy

Abstract

This letter investigates the dynamical behavior of the absorption in a superconducting quantum circuit with a tunable V-type artificial molecule constructed by two superconducting Josephson charge qubits coupled with each other through a superconducting quantum interference device. It is found that the ratio of the Josephson coupling energy to the capacitive coupling strength provides an extra controlling parameter for manipulating transient absorption behaviors. It is also realized that in the presence of an incoherent pumping field, lasing without inversion can be obtained just through the joint effect of the Josephson coupling energy and the capacitive coupling strength. Results may provide some new possibilities for solid-state quantum information science.

Light Amplification without Inversion from Hybrid Quantum Dot–Resonator Circuit: Floquet Nonequilibrium Green's Function Approach

“…Circuit quantum electrodynamics (cQED) has opened up intriguing possibilities for exploring coherent effects. Examples of such effects include coherent population trapping (CPT), [ 1 ] transparency induced by an electromagnetic field (EIT), [ 2–7 ] light amplification without inversion (AWI), [ 8 ] lasing without inversion (LWI), [ 2,9,10 ] and reduction of quantum noise. [ 11–15 ] Of these, the gain without inversion (GWI) can be interpreted as a nonlinear interference effect with a different origin in different systems.…”

“…[ 11–15 ] Of these, the gain without inversion (GWI) can be interpreted as a nonlinear interference effect with a different origin in different systems. [ 2,8–10,16 ] GWI generally arises in noninverted atomic media, when the reciprocity breaks between absorption and stimulated emission, and the lower level population exceeds the upper level population. [ 17 ]…”

Super/subradiant second harmonic generation

“…We utilize this nonlinearity to obtain SHG in super/subradiant regimes. Recently developed new semiconductor structures, such as semiconductor quant um wells [6][7][8][9], superconducting quantum circuits [10][11][12], and evanescently coupled waveguides [13,14] can be designed to have equally spaced levels, which makes them suitable for experimental realization of the super/subradiant SHG. A review of recent studies in nonlinear crystals is given in [15].…”

“…In terms of nonlinear optics the scheme studied in [3] can be considered as a sum frequency generation, as it produces a field whose frequency is a sum of the frequencies of the two pumping lasers. Our theory is targeted at solid structures, in which all three transitions can be dipole-allowed, such as Ruby [26], semiconductor quantum wells [6][7][8][9], superconducting quantum circuits [10][11][12], and evanescently coupled waveguides [13,14]. Here we consider a three-level scheme in which both non-lasing transitions have equal resonant frequencies, so they can be pumped by the same laser, and hence the frequency of the generated field is twice the frequency of the pumping laser.…”

Atom position measurement in a four-level Lambda-shaped scheme with twofold lower-levels

“…Also, a number of quantum optical phenomena based on quantum coherence and quantum interference have studied (Harris 1989;Wu and Yang 2005;Li et al 2011;Wang and Yu 2012;Hamedi 2014;Wu and Yang 2007;Wu 2005;Hamedi et al 2014;Bai et al 2010;Wang et al 2013;Hamedi 2015;Wu and Yang 2004;Hamedi et al 2013;Hamedi 2014;Ou et al 2009;Han et al 2011;Yang et al 2008;Ding et al 2010;Zhang et al 2013;Wu and Yang 2007;Wu et al 1999;Wang et al 2012;Yang et al 2009;Li et al 2006Li et al , 2008Li 2007;Zhang et al 2012;Cheng et al 2004). There exist various one dimensional (1D) and two dimensional (2D) schemes for atom and electron localization properties of media by monitoring spontaneous emission spectrum and by monitoring absorption of a weak probe field (Sahrai et al 2005;Kapale and Zubairy 2006;Xu et al 2008;Li et al 2011;Ding et al 2011;Wang and Yu 2014;Ding et al 2011a, b;Zhang et al 2014;Hamedi 2014;Wang et al 2013).…”