Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro, 5, I-00185 Roma, Italy.
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro, 5, I-00185 Roma, Italy and Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (INO-CNR), Largo Enrico Fermi, 6, I-50125 Firenze, Italy.
Phys Rev Lett. 2013 Nov 27;111(22):220501. doi: 10.1103/PhysRevLett.111.220501. Epub 2013 Nov 26.
We demonstrate experimentally the possibility of efficiently detecting properties of quantum channels and quantum gates. The experimentally realized quantum channel detection method has been recently proposed theoretically, and allows us to characterize the properties of quantum channels with a much smaller experimental effort than quantum process tomography. Here, the optimal detection scheme is first achieved for nonentanglement breaking channels of the depolarizing form and is based on the generation and detection of polarized entangled photons. We then demonstrate channel detection for nonseparable maps by considering the CNOT gate and employing two-photon hyperentangled states.
我们实验证明了高效检测量子通道和量子门属性的可能性。最近，该实验实现的量子通道检测方法在理论上被提出，并允许我们以比量子过程层析术小得多的实验努力来表征量子通道的特性。在这里，首先针对退极化形式的非纠缠破坏通道实现了最优检测方案，该方案基于极化纠缠光子的产生和检测。然后，我们通过考虑 CNOT 门并采用双光子超纠缠态，对不可分离映射进行了通道检测。
