Contrary to the usual assumption of at least partial control of quantum dynamics, a surprising recent result proved that an arbitrary quantum state can be probabilistically reset to a state in the past by having it interact with probing systems in a consistent but uncontrolled way. We present a photonic implementation to achieve this resetting process, experimentally verifying that a state can be probabilistically reset to its past with a fidelity of $0.870 \pm 0.012$. We further demonstrate the preservation of an entangled state, which still violates a Bell inequality, after half of the entangled pair was reset. The ability to reset uncontrolled quantum states has implications in the foundations of quantum physics and applications in areas of quantum technology.

中文翻译：

---

量子复位的光子实现

与通常至少部分控制量子动力学的通常假设相反，最近的令人惊讶的结果证明，通过使量子态以一致但不受控制的方式与探测系统相互作用，可以任意地将量子态重置为过去的状态。我们提出一种光子实现方式来实现此重置过程，并通过实验验证状态可以以$ 0.870 \ pm 0.012 $的保真度概率地重置为其过去。我们进一步证明了在纠缠对的一半重置之后，仍然保留了Bell不等式的纠缠状态的保留。重置不受控制的量子态的能力对量子物理学的基础和在量子技术领域的应用产生了影响。