Orieux Adeline, Ciampini Mario A, Mataloni Paolo, Bruß Dagmar, Rossi Matteo, Macchiavello Chiara
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro, 5, I-00185 Roma, Italy.
Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (INO-CNR), Largo Enrico Fermi, 6, I-50125 Firenze, Italy.
Phys Rev Lett. 2015 Oct 16;115(16):160503. doi: 10.1103/PhysRevLett.115.160503.
We experimentally show how classical correlations can be turned into quantum entanglement, via the presence of dissipation and the action of a CNOT gate. We first implement a simple two-qubit protocol in which entanglement production is not possible in the absence of such kind of noise, while it arises with its introduction, and is proportional to its amount. We then perform a more elaborate four-qubit experiment, by employing two hyperentangled photons initially carrying only classical correlations. We demonstrate a scheme where the entanglement is generated via local dissipation, with the advantage of being robust against local unitaries performed by an adversary.
我们通过耗散的存在和一个CNOT门的作用，实验性地展示了经典关联如何能转变为量子纠缠。我们首先实现了一个简单的双量子比特协议，在没有此类噪声的情况下不可能产生纠缠，但引入噪声后纠缠就会出现，且与噪声量成正比。然后，我们通过使用最初仅携带经典关联的两个超纠缠光子，进行了一个更复杂的四量子比特实验。我们展示了一种通过局部耗散产生纠缠的方案，其优点是对对手执行的局部酉变换具有鲁棒性。
