论文标题
在相关的量子通道中保护量子渔民信息
Protecting quantum Fisher information in correlated quantum channels
论文作者
论文摘要
量子Fisher信息（QFI）在量子计量任务中具有潜在的应用。当量子通道对QUBIT序列的连续作用具有部分经典相关性时，我们研究QFI。我们的结果表明，虽然将反应效应不利于QFI，但这种经典相关性对QFI的影响依赖于通道依赖性。对于贝尔型探针状态，可以利用去极化和相位翻转通道的连续作用的经典相关性以改善QFI，而位flip和位相思流道中的经典相关性会导致QFI略有下降。对于探针状态的更一般的参数化形式，使用初始相关系统改进QFI的优势也可以保留在相关量子通道的广泛方案中。
Quantum Fisher information (QFI) has potential applications in quantum metrology tasks. We investigate QFI when the consecutive actions of a quantum channel on the sequence of qubits have partial classical correlations. Our results showed that while the decoherence effect is detrimental to QFI, effects of such classical correlations on QFI are channel-dependent. For the Bell-type probe states, the classical correlations on consecutive actions of the depolarizing and phase flip channels can be harnessed to improve QFI, while the classical correlations in the bit flip and bit-phase flip channels induce a slight decrease of QFI. For a more general parameterization form of the probe states, the advantage of using initial correlated system on improving QFI can also be remained in a wide regime of the correlated quantum channels.
