Distilling single-photon entanglement from photon loss and decoherence

Abstract

Single-photon entanglement may be the simplest type of entanglement but it is of vice importance in quantum communication. Here we present a practical protocol for distilling the single-photon entanglement from both photon loss and decoherence. With the help of some local single photons, the probability of single photon loss can be decreased and the less-entangled state can also be recovered to maximally entangled state simultaneously. It only requires some linear optical elements which makes it feasible in current experiment condition. This protocol might find applications in current quantum communications based on the quantum repeaters.

Efficient Quantum Secure Direct Communication Using the Orbital Angular Momentum of Single Photons

“…In the practical QSDC, photon loss will inevitably reduce the efficiency of communication. Here we noticed that the quantum state amplification [39][40][41][42][43] is recently proposed to overcome the photon loss which would make the quantum communication more feasible.…”

The heralded amplification for the single-photon multi-mode W state of the time-bin qubit

“…In this way, the entanglement between two distant locations decreases exponentially with the length of the transmission channel. The noiseless linear amplification (NLA) is an effective method to overcome the exponential fidelity decay [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. In 2012, Zhang et al proposed the NLA to protect the two-mode SPE from photon loss [32].…”

Protecting sing-photon multi-mode W state from photon loss

“…The noise will make the photon loss. One of the powerful ways to overcome the photon loss is the photon noiseless linear amplification (NLA) [21][22][23][24][25][26][27][28][29][30][31], which was first proposed by Ralph and Lund [21]. The way of heralded qubit amplifier was discussed for device-independent QKD for several groups [22][23][24].…”