Abstract
A quantum receiver is an essential element of quantum illumination (QI) which outperforms its classical counterpart, called classical-illumination (CI). However, there are only few proposals for realizable quantum receiver, which exploits nonlinear effects leading to increasing the complexity of receiver setups. To compensate this, in this article, we design a quantum receiver with linear optical elements for Gaussian QI. Rather than exploiting nonlinear effect, our receiver consists of a 50:50 beam splitter and homodyne detection. Using double homodyne detection after the 50:50 beam splitter, we analyze the performance of the QI in different regimes of target reflectivity, source power, and noise level. We show that our receiver has better signal-to-noise ratio and more robust against noise than the existing simple-structured receivers.
Highlights
Superposition and entanglement are properties mainly exploited in quantum information processing protocols, such as quantum communication [1,2] and quantum computing [3]
Different from other quantum information processing protocols, it was shown that quantum illumination (QI) has advantages compared with its classical counterpart, called classical illumination (CI), with the same transmission energy under a decoherence channel, even when entanglement is not left after passing through the channel
Using our double homodyne detection (HD) setup, we investigate the performance of Gaussian QI in different regimes of target reflectivity and source power, which is compared with the optical parametric amplifier (OPA) receiver and the phase conjugate (PC) receiver [34,35]
Summary
Superposition and entanglement are properties mainly exploited in quantum information processing protocols, such as quantum communication [1,2] and quantum computing [3]. In 2008, Lloyd presented a binary hypothesis testing protocol using entangled states in a single-photon level, called quantum illumination (QI), to improve a capability of target detection in an optical radar [4]. A scheme of feed-forward sum-frequency generation (FF-SFG) [36] asymptotically approaches to the quantum Chernoff bound, but it has not been demonstrated due to the hardness of its implementation. Those quantum receivers are designed for exploiting nonlinear effects in order to measure correlation between two modes used in QI. We propose a quantum receiver for Gaussian QI that does not include a nonlinear optical element.
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