Entanglement purification for quantum communication

By Jian-Wei Pan, C. Simon, Č. Brukner, Anton Zeilinger. Nature, 2000

694 citations recorded by the source corpus.

The distribution of entangled states between distant locations will be essential for the future large-scale realization of quantum communication schemes such as quantum cryptography and quantum teleportation. Because of unavoidable noise in the quantum communication channel, the entanglement between two particles is more and more degraded the further they propagate. Entanglement purification is thus essential to distil highly entangled states from less entangled ones. Existing general purification protocols are based on the quantum controlled-NOT (CNOT) or similar quantum logic operations, which are very difficult to implement experimentally. Present realizations of CNOT gates are much too imperfect to be useful for long-distance quantum communication. Here we present a scheme for the entanglement purification of general mixed entangled states, which achieves 50 per cent of the success probability of schemes based on the CNOT operation, but requires only simple linear optical elements. Because the perfection of such elements is very high, the local operations necessary for purification can be performed with the required precision. Our procedure is within the reach of current technology, and should significantly simplify the implementation of long-distance quantum communication.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/d93a46e1b7f61965b842ff8850fd8bf9de068bd6

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Citations in the corpus

Entanglement distillation from Gaussian input states (2010, background): “[10] Pan, J.”
Do We Really Understand Quantum Mechanics? (2012, methodology): “Experimentally, this method has been successfully tested [373], nevertheless with a success rate that is smaller than the maximal rate in theory; the involved protocols are difficult to implement, so that making some compromise is necessary.”
Multiphoton entanglement and interferometry (2008, methodology): “The realization of a high intensity source of fourphoton GHZ entanglement (Pan et al., 2001a, see also a related experiment by Eibl et al., 2003), allowed Zhao et al. (2003a) to report the first four-photon GHZ-type laboratory falsification of local realism.”
Quantum repeaters based on atomic ensembles and linear optics (2009, methodology): “On the one hand, a protocol for the entanglement purification of photon pairs with linear optics was proposed by (Pan et al., 2001).”
Micius quantum experiments in space (2022, background): “Using only linear optics, Pan et al. (2001) put forward a feasible scheme for entanglement purification with high precision and efficiency.”