论文标题
传输量子的经典成本
Classical Cost of Transmitting a Qubit
论文作者
论文摘要
我们考虑一般的准备和衡量场景，在这些情况下，爱丽丝可以将Qubit状态传输到Bob，后者可以以正面操作员值衡量标准（POVM）的形式进行一般测量。我们表明，在任何此类量子协议中获得的统计数据都可以通过共享随机性和两个交流位的纯粹经典手段来模拟。此外，我们证明了两个沟通是完美古典模拟的最低成本。此外，我们将方法应用于贝尔场景，该场景扩展了著名的碳粉和培根方案。特别是，两个沟通足以模拟与应用于任何纠缠的两量态状态的任意局部POVM相关的所有量子相关性。
We consider general prepare-and-measure scenarios in which Alice can transmit qubit states to Bob, who can perform general measurements in the form of positive operator-valued measures (POVMs). We show that the statistics obtained in any such quantum protocol can be simulated by the purely classical means of shared randomness and two bits of communication. Furthermore, we prove that two bits of communication is the minimal cost of a perfect classical simulation. In addition, we apply our methods to Bell scenarios, which extends the well-known Toner and Bacon protocol. In particular, two bits of communication are enough to simulate all quantum correlations associated to arbitrary local POVMs applied to any entangled two-qubit state.
