Fig. 5: Mid-infrared TGI results using Hadamard patterns.

a Temporal waveforms measured at 3.4 μm after the PPLN crystal, confirming that the Hadamard patterns modulating the 1542 nm signal can be successfully transfer to the idler at 3.4 μm through frequency downconversion. The modulation speed of the AOM1 is set as 625 kbps. b Experimental result of computational TGI obtained from 32 realizations of Hadamard patterns (cyan solid line) for a 625 kbps temporal object. The Hadamard patterns are modulating the 1542 nm signal at a speed of 1.25 Mbps. c Experimental ghost image obtained from 32 realizations of Hadamard patterns (cyan solid line) for a 5 Mbps temporal object. The Hadamard patterns are modulating the 1542 nm signal at a speed of 10 Mbps. The blue dashed line in (b, c) corresponds to direct detection with a 1 MHz bandwidth mid-infrared photodetector