量子读出中的超可加性和纠缠辅助
Super-Additivity and Entanglement Assistance in Quantum Reading
摘要：
量子信息理论决定了信息可以通过量子力学描述的物理系统传输的最大速率。在这里，我们考虑称为量子读取的通信协议。量子读取是用于通过使用量子探针来检索存储在数字存储器中的信息的协议，例如，发光的量子态来读取光存储器。在各种情况下，使用量子探针增强了读取协议在保真度、数据密度和能量耗散方面的性能。在这里，我们回顾和表征的量子读取能力的记忆模型，定义为可靠的阅读的最大速率。我们证明了，和量子信息理论中的其他量一样，量子读取容量是超加性的。此外，我们确定的条件下使用的纠缠辅助提高量子读取的性能。
英文摘要：
Quantum information theory determines the maximum rates at which information can be transmitted through physical systems described by quantum mechanics. Here we consider the communication protocol known as quantum reading. Quantum reading is a protocol for retrieving the information stored in a digital memory by using a quantum probe, e.g., shining quantum states of light to read an optical memory. In a variety of situations using a quantum probe enhances the performances of the reading protocol in terms of fidelity, data density and energy dissipation. Here we review and characterize the quantum reading capacity of a memory model, defined as the maximum rate of reliable reading. We show that, like other quantities in quantum information theory, the quantum reading capacity is super-additive. Moreover, we determine conditions under which the use of an entangled ancilla improves the performance of quantum reading.
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