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A large payload bidirectional quantum secure direct communication (BQSDC)protocol without information leakage is proposed, which is based onentanglement swapping between any two GHZ states. Two remote authorizedparties, Alice and Bob, can safely exchange their individual secret messageswithout worrying about the information leakage problem. Our protocol uses ashared secret GHZ state to overcome the information leakage problem. The sharedsecret GHZ state plays two roles in the bidirectional communication process: onone hand, it lets Bob know the prepared initial state; on the other hand, it isused for encoding Bob's secret messages. Moreover, our protocol can transmitsix bits of secret messages per round communication. Compared with thoseprevious BQSDC protocols, the advantage of our protocol lies in having thefollowing two characters simultaneously: on one hand, it overcomes theinformation leakage problem; one the other hand, its capacity is as high as sixbits per round communication.

Large payload bidirectional quantum secure direct communication without information leakage