Quantum illumination via quantum-enhanced sensing

Quantum illumination with non-Gaussian states: Bounds on the minimum error probability using quantum Fisher information

“…Here, we show that, contrary to the findings in Ref. [17], the QFIs for the optimized N PE states are slightly lower than those of the coherent states when the signal energy is constrained to be equal. By performing an exact calculation, we also show that the signal-to-noise ratio decreases monotonically as thermal noise is increased.…”

“…Surprisingly, it was shown that an entangled Gaussian quantum probe, namely the two-mode squeezed vacuum (TMSV) state, enhances the performance of the task and that the enhancement is maximal for low signal energy and large thermal noise [2]. Many theoretical developments [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and experiments [21][22][23][24][25][26] have followed in the subsequent decade, which are well documented in reviews [27][28][29]. An extension to radio-wave frequency has been proposed and proof-of-principle experiments have been demonstrated [30][31][32][33][34].…”

“…Possible advantages of using N PE states in QI were first investigated in Ref. [17], where an optimized N PE state was shown to outperform the coherent state under repetitive local measurement strategies. The optimum N PE state, for a given value of N , was found by numerically maximizing the QFI.…”

Noise-robust single-pixel imaging in photon counting regime with a pulsed source

“…Quantum correlations between photon-pairs generated via spontaneous parametric downconversion (SPDC) have been widely used for quantum imaging to enhance the performance of the image formation over the classical limit [1,2]. After it was demonstrated that the quantum advantages can still be valid in a lossy and noisy environment that degrades the initial quantum states [3][4][5][6][7][8], quantum correlations have been employed in imaging to achieve noise-robustness. Recently, notable imaging methods that exploit a spatially correlated twin-beam and multi-pixel camera have been introduced and have demonstrated the noise-robustness of quantum illuminated imaging [9,10].…”

Heralded single-pixel imaging with high loss-resistance and noise-robustness

“…Non-classical correlations of light have been employed to enhance the sensitivity and signal-to-noise ratio (SNR) beyond the classical limits in quantum information processing [1][2][3][4][5] . Especially, quantum illumination (QI) [6][7][8][9] , which discriminates a presence and absence of a low reflectivity target using entangled states in noisy environments, outperforms the classical target sensitivity while quantum correlation survives without entanglement. Recently, nonclassical correlation-based imagings with QI have been experimentally demonstrated.…”