Conditional phase shift for quantum CCNOT operation
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We suggest the improvement of description methods for quantum phase gate implementation based on cavity QED. Qubits are encoded into two lowest Fock states. Three qubit phase transformation is resulted from the interaction between Rydberg atom and three modes of cavity electromagnetic field. Evolution of conditional field states after atom measurement is described by Kraus operators. We show that one of these operators corresponds to conditional evolution without quantum jumps and is very convenient for phase gate implementation. Also we describe cavity based generating EPR pair from certain initially disentangled state.
KeywordsQuantum phase gate Cavity QED Rydberg atom Conditional field state Kraus transformer
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