Journal: Science Advances

Article Title: Quantum state revival via coherent energy redistribution

doi: 10.1126/sciadv.ady8981

Figure Lengend Snippet: ( A ) A TAI, analogous to a lens array, redistributes a spatial image into an array of spots. This device focuses coherent light rays, represented by orange arrows in the image of interest, that are approximately parallel to each other within the extent of a lens. In contrast, the incoherent noise components (gray) point in random directions and are not focused, allowing to discriminate the image of interest from the noise background. ( B ) Recovery of a deteriorated quantum state using the qTAI, here shown in the temporal domain. The joint distribution of the biphotons undergoes two successive (2D) phase manipulations, namely, temporal phase modulation and dispersive propagation, respectively equivalent to a 2D lens array and free-space diffraction processes. The temporal phase mask can conveniently be limited to a phase excursion of 2 π on each photon for practical implementation via electro-optic technologies. The excursion of the spectral phase profile can easily extend over hundreds of π through available dispersive elements. This leads to an energy redistribution in the joint distribution, allowing for denoising via postselection on the output peaks.

Article Snippet: The pump beam is generated by modulating a continuous-wave laser (NKT Koheras BASIK E15, centered at 1550.1 nm) with a pulse sequence at a repetition rate of 52.8 MHz using an electro-optic intensity modulator driven by an AWG (Keysight M8196A, 32-GHz analog bandwidth).

Techniques:

Journal: Science Advances

Article Title: Quantum state revival via coherent energy redistribution

doi: 10.1126/sciadv.ady8981

Figure Lengend Snippet: ( A ) Radio frequency (RF) signal generated by the AWG used to drive the electro-optic PM for the qTAI, as measured by a 28-GHz real-time oscilloscope (blue trace, left y axis), compared to the theoretically designed phase pattern (dashed red trace, right y axis). ( B ) Classical characterization of the energy redistribution of a ~25-ns square pulse, with a measured amplification factor of 43, as shown by the scaled version of the waveform measured at the output of the sampling module with the PM off. The vertical scale is shown as normalized units (n.u.). The TAI pulses are separated by t q = 2.476 n s, featuring a pulse intensity full width at half maximum (FWHM) of 33.7 ps, as shown in ( C ).

Article Snippet: The pump beam is generated by modulating a continuous-wave laser (NKT Koheras BASIK E15, centered at 1550.1 nm) with a pulse sequence at a repetition rate of 52.8 MHz using an electro-optic intensity modulator driven by an AWG (Keysight M8196A, 32-GHz analog bandwidth).

Techniques: Generated, Amplification, Sampling