Deterministic and Universal Quantum Squeezing Gate with a Teleportation‐Like Protocol.

Squeezing transformation as an essential component of quantum information processing, gives rise to the possibility to perform various tasks such as distributed quantum computation and the quantum‐logic gate. However, the reported squeezing gate with best performance so far is realized with low success probability, while the performance of the deterministic ones is currently circumscribed by the limited squeezing degree of the nonclassical ancilla. To address this issue, a new scheme of deterministic and universal quantum squeezing gate with the property of nonlocal operation owing to the teleportation‐like protocol is developed and demonstrated. A high‐fidelity squeezing operation, even when the level of target squeezing being up to 10 dB, is demonstrated where a squeezed state with nonclassical noise reduction of 6.5 dB is directly observed. Moreover, a high‐fidelity complex operation including a Fourier transformation and a phase squeezing gate are performed, exploring the potential of implementing the complex task of quantum information processing with the presented functional unit. The method can be applied to distributed quantum processor, the creation of exotic nonclassical states, and quantum error correction. [ABSTRACT FROM AUTHOR]