https://researchdata.se/en/catalogue Search results en We propose a contextual cavity/circuit QED analogue and extension of the Stern-Gerlach experiment, where the pseudo-spin of a two-state `atomic' transition plays the role of the ``spin'', while the resonant field driving the transition stands for the ``magnetic field''. A phase-sensitive continuous detection of the cavity field coupled to the induced `atomic' dipole affects the stability of the two distinct outcomes. The dressed states comprising the latter give their place to a self-consistent spontaneous dressed-state polarization as the driving strength is lowered. The associated evolution proves anew highly contextual, underpinned by a persistent production of coherent-state superpositions for a particular setting of the monitoring device. Finally, when bistability is absent, we employ the photoelectron `atomic' emission statistics as a diagnostic tool of the cavity field fluctuations. The present dataset contains codes and data as MATLAB .m and .mat files, respectively. Data generated and used for each figure are grouped according to the figure order in the manuscript. For example, the folder FIG2/D300_pi_2 contains data collected for a drive amplitude ratio over dissipation rate equal to 300, and the local oscillator phase set to pi/2 in homodyne detection. As another example, the file titled Wss_30.mat contains the matrix data corresponding to the steady-state Wigner function of the cavity for a drive amplitude ratio over dissipation rate equal to 30, plotted in Fig. 3. For the same figure, the file titled, e.g., W23340.mat contains the matrix data corresponding to the conditioned Wigner function at the time t=(23340-1)*dt. The time step dt is set in the main code generating the individual trajectories. The main MATLAB code used for generating quantum trajectories under homodyne (heterodyne) detection is Stern_Gerlach.m (Stern_Gerlach_het.m). A version for operation in the bad cavity limit is also included. Tue, 28 Apr 2026 00:00:00 GMT https://researchdata.se/en/catalogue/dataset/doi-10-17045-sthlmuni-32099488 https://researchdata.se/en/catalogue/dataset/doi-10-17045-sthlmuni-32099488 Stockholm University Themistoklis Mavrogordatos We propose an experimental apparatus to reveal the quantum coherence manifested in downward quantum jumps of amplitude bistability. The underlying coherent superposition of macroscopic quantum states is translated into the statistical properties of the integrated charge deposited in the detector circuit of a mode-matched heterodyne/homodyne detection scheme. At first, the dynamical evolution of a signal transmitted from an auxiliary cavity is employed to pinpoint a macroscopic switching event in a bistable main cavity subject to direct photodetection. Once the decision is made on the occurrence of a downward switch, the main cavity mode is let to freely decay to the vacuum, monitored to the production of an integrated charge. In the long-time limit, the charge distribution over an identical collection of pure states generated during the jumps converges to the Q function (heterodyne detection) or marginals of the Wigner function (homodyne detection) dictated by the phase of the local oscillator. When fluctuations over the ensemble step in, we connect the statistical properties of several switching events and the ensuing production of current records, to the cavity field correlations associated with the breakdown of photon blockade. The present dataset contains codes and data as MATLAB .m and .mat files, respectively. Data generated and used for each figure are grouped according to the figure order in the manuscript. For example, FIG4/Qss.mat corresponds to the matrix data used to plot the steady-state Q function in inset (i) of. Fig. 4(a). The main MATLAB code used for generating quantum trajectories in quantum amplitude bistability is titled JCRK4_Amp_Bist.m. In the script titled Direct_Adiabatic_Second.m, the coherent cancellation process is modelled. Charge trajectories and associated statistics for homodyne and heterodyne detection are generated via HetChargeHist.m and potentialHomodyne.m, respectively. The code HomCat.m accomplishes a Monte-Carlo simulation of cat-state decay trajectories under homodyne detection. Finally, the auxiliary script Qfunction.m plots Q functions of the conditioned cavity state. Thu, 19 Feb 2026 00:00:00 GMT https://researchdata.se/en/catalogue/dataset/doi-10-17045-sthlmuni-31366063 https://researchdata.se/en/catalogue/dataset/doi-10-17045-sthlmuni-31366063 Stockholm University Themistoklis Mavrogordatos