a) Explain what is meant by QKD.
b) The following eleven statements refer to the transmission of an encryption key using quantum key distribution protocols.
Put each statement into its correct sequence, 1-11. The first one has been numbered for you.

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sequence statement the sender and receiver are now fully synchronised the photons are sent through four random polarisers which give one of four possible polarisations and bit values the process is repeated until the whole of the encryption key has been transmitted 1 the sender uses a light source to create the photons one of the two beam splitters is chosen at random and the photon detectors are read the sender now informs the recipient where, in the sequence, the correct beam splitters had been used the polarised photons travel along the fibre optic cable to the destination the encryption key can now be sent and received safely since eavesdroppers would find it impossible to crack the key code the sender now compares this sequence to the polarisation sequence used by the sending station at the destination, there are two beam splitters (diagonal and vertical/ horizontal) and two photon detectors the recipient sends back the sequence of beam splitters to the sender ate Windla