Hyperentanglement-enhanced quantum illumination

In quantum illumination, the signal mode of light, entangled with an idler mode, is dispatched towards a suspected object bathed in thermal noise and returning along stored measured to determine presence or absence object. this process, entanglement destroyed but its benefits form classical correlations enlarged Hilbert space survive. Here, we propose use probe state hyperentangled two degrees freedom - polarization frequency, achieve significant 12dB performance improvement error probability exponent over best known illumination procedure low regime. We present simple receiver model using four optical parametric amplifiers (OPA) that exploits hyperentanglement match feed-forward sum-frequency generator (FF-SFG) high By replacing each OPA proposed FF-SFG receiver, further 3dB lone can be seen.