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Experimental demonstration of efficient superdense coding in the presence of non-Markovian noise | | Bi-Heng Liu
; Xiao-Min Hu
; Yun-Feng Huang
; Chuan-Feng Li
; Guang-Can Guo
; Antti Karlsson
; Elsi-Mari Laine
; Sabrina Maniscalco
; Chiara Macchiavello
; Jyrki Piilo
; | | Date: |
28 Apr 2015 | | Abstract: | Many quantum information tasks rely on entanglement, which is used as a
resource, for example, to enable efficient and secure communication. Typically,
noise, accompanied by loss of entanglement, reduces the efficiency of quantum
protocols. We demonstrate experimentally a superdense coding scheme with noise,
where the decrease of entanglement in Alice’s encoding state does not reduce
the efficiency of the information transmission. Having almost fully dephased
classical two-photon polarization state at the time of encoding, we reach
values of mutual information close to 1.52 (1.89) with 3-state (4-state)
encoding. This high efficiency relies both on non-Markovian features, that Bob
exploits just before his Bell-state measurement, and on very high visibility
(99.6$\%$) of the Hong-Ou-Mandel interference within the experimental set-up.
Our proof-of-principle results pave the way for exploiting non-Markovianity to
improve the efficiency and security of quantum information processing tasks. | | Source: | arXiv, 1504.7572 | | Services: | Forum | Review | PDF | Favorites | |
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