Multi-copy entanglement purification with practical spontaneous parametric down conversion sources |
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| Affiliation: | 1.Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;2.College of Mathematics & Physics, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;3.Bell Honors School, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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| Abstract: | Entanglement purification is to distill the high quality entanglement from the low quality entanglement with local operations and classical communications. It is one of the key technologies in long-distance quantum communication. We discuss an entanglement purification protocol(EPP) with spontaneous parametric down conversion(SPDC) sources, in contrast to previous EPP with multi-copy mixed states, which requires ideal entanglement sources. We show that the SPDC source is not an obstacle for purification, but can benefit the fidelity of the purified mixed state. This EPP works for linear optics and is feasible in current experiment technology. |
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| Keywords: | quantum communication entanglement entanglement purification |
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