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The aim of controlled quantum teleportation is to realize communication between Alice and Bob to cooperate with a trusted controller Charlie successfully. However, we show that the dishonest Bob can obtain the initial Alice's secret message with 50 percents without the permission of Charlie. We propose an improved controlled quantum teleportation scheme by using quantum entanglement swapping in quantum...
We proposes a verifiable quantum secret sharing protocol based on entanglement swapping in this paper. It provides one-to-one communication to dealer who want to connect with the other participants. The dealer chooses the detection or information mode by uniform distribution until he can make sure the information to the participant is safe, and then communicates with the next participant. It can prevent...
Hwang et al. (Phys. Scr. 83:045004, 2011) proposed a high efficient multiparty quantum secret sharing by using Greenberger-Horne-Zeilinger (GHZ) states. But Liu et al. (Phys. Scr. 84:045015, 2011) analyzed the security of Hwang et al.’s protocol and found that it was insecure for Charlie who might obtain half of information about the dealer’s secret directly. They put forward an improved protocol...
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