论文标题
在辅助量子辅助辅助模式下确定性和选择性光子添加的实验性实现
Experimental realization of deterministic and selective photon addition in a bosonic mode assisted by an ancillary qubit
论文作者
论文摘要
玻感量子误差校正代码主要旨在防止单光子丢失。为了纠正这种类型的错误，可以在具有确定的光子奇偶校验的代码空间中编码逻辑量子，例如CAT代码或二项式代码。错误校正需要一个恢复操作，该操作将误差状态映射为奇偶校验的错误状态 - 回到代码状态。在这里，我们意识到了在玻体模式下的光子选择性，同时的光子添加操作的集合，即微波腔，并在超导值的辅助下。这些操作是作为两光子过渡实施的，同时激发了腔和量子。 Qubit的额外自由度使得可以在相反光子平价的空间之间实现连贯的单向映射。我们介绍了驱动器的成功实现及其在Fock状态的叠加上实现的相位控制。当添加量子重置时，所提出的技术适用于骨系统中的自主量子误差校正，并且更普遍地，在掌位模式下实现一系列非自动转换的可能性。
Bosonic quantum error correcting codes are primarily designed to protect against single-photon loss. To correct for this type of error, one can encode the logical qubit in code spaces with a definite photon parity, such as cat codes or binomial codes. Error correction requires a recovery operation that maps the error states -- which have opposite parity -- back onto the code states. Here, we realize a collection of photon-number-selective, simultaneous photon addition operations on a bosonic mode, a microwave cavity, assisted by a superconducting qubit. These operations are implemented as two-photon transitions that excite the cavity and the qubit at the same time. The additional degree of freedom of the qubit makes it possible to implement a coherent, unidirectional mapping between spaces of opposite photon parity. We present the successful experimental implementation of the drives and the phase control they enable on superpositions of Fock states. The presented technique, when supplemented with qubit reset, is suitable for autonomous quantum error correction in bosonic systems, and, more generally, opens the possibility to realize a range of non-unitary transformations on a bosonic mode.
