Maharshi Ray

Work is being done to optimise the resource requirement of multiqubit secret sharing protocols. We propose a (2-2)-threshold protocol where two secrets (in the form of quantum states) is secretly shared using ‘left-over’ states. The reusability of quantum resources help in reducing the resource requirement. Later we extend the protocol to sharing of any number of quantum secrets. The secrets need not be available to the Dealer at the beginning of the protocol. The dealer can share the sequence of secrets as and when he has them at a desired time. Hence we call it a ‘Delay Protocol’. We analyse the resource requirement and the security associated with the protocol against eavesdropping . Lastly, we discuss the idea of a quantum bank, where a Dealer can introduce (deposit) her quantum state (secret) in a network such that no one in the network gets to learn anything about it. However, when she wishes she can reconstruct it back (withdraw) from the network.