Figure 1

Schematic of the CV quantum erasing scheme. BS: beam splitter, PBS: polarizing beam splitter, and PM: phase modulator.Reuse & Permissions

Figure 2

Experimental results for the CV quantum erasing concept. (a) shows the quantum noise level of the input state, (b) is the phase quadrature noise level of the signal output (upper trace) and the amplitude quadrature noise of the marker output (lower trace), and (c) is the conditioned phase quadrature noise level. Note that the noise levels have been normalized by the respective gains. The dashed line represents the noise level expected for a classical device corresponding to no squeezing. Resolution bandwidth: 300 kHz. Video bandwidth: 30 Hz. Sweep time: 5 sec.Reuse & Permissions

Figure 3

Added noise values for the amplitude quadrature of the marker output without erasing $N_{x_s,\mathrm{i}\mathrm{n}\to x_m,\mathrm{o}\mathrm{u}\mathrm{t}}$ (open diamonds), the phase quadrature of the signal output without erasing $N_{p_s,\mathrm{i}\mathrm{n}\to p_s,\mathrm{o}\mathrm{u}\mathrm{t}}$ (circles), and the phase quadrature of the signal output with erasing $N_{p_s,\mathrm{i}\mathrm{n}\to p_c}$ (squares). The dashed line is the best linear fit to the measured values.Reuse & Permissions

Figure 4

Experimental results for quantum erasing using an electro-optic feed forward loop. (a) shows the noise traces of the signal output before and after the erasing operation and (b) shows the estimated contours of the Wigner funtions. Resolution bandwidth: 300 kHz. Video bandwidth: 30 Hz.Reuse & Permissions