Signatures of Incoherence in a Quantum Information Processor

摘要: Incoherent noise is manifest in measurements of expectation values when the underlying ensemble evolves under a classical distribution unitary processes. While many incoherent processes appear decoherent, there are important differences. The functions either static or slowly varying with respect to control operations and so errors introduced by these distributions refocusable. observation incoherence small Hilbert spaces well known. Here we explore during an entangling operation, such as relevant quantum information processing. As expected, it more difficult separate decoherence over However, studying fidelity decay cyclic map able identify distinctive experimental signatures incoherence. This demonstrated both through numerical simulations experimentally three qubit nuclear magnetic resonance implementation.