Efficient quantum key distribution with trines of reference-frame-free qubits

  title={Efficient quantum key distribution with trines of reference-frame-free qubits},
  author={Gelo Noel M. Tabia and Berthold-Georg Englert},
  journal={Physics Letters A},
Abstract We propose a rotationally-invariant quantum key distribution scheme that uses a pair of orthogonal qubit trines, realized as mixed states of three physical qubits. The measurement outcomes do not depend on how Alice and Bob choose their individual reference frames. The efficient key generation by two-way communication produces two independent raw keys, a bit key and a trit key. For a noiseless channel, Alice and Bob get a total of 0.573 key bits per trine state sent (98% of the Shannon… Expand

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