| Popis: |
We describe a concatenated-cavities system that is capable of creation, storage, and on-demand release of a heralded optical quantum state. Here, two optical cavities are concatenated, where one is a memory cavity to store a quantum state inside, and the other, placed at the output of the memory cavity, is a shutter cavity to control the release from the memory cavity. When quantum entanglement is created by means of parametric down conversion and shared between two frequency modes inside the memory cavity, it is possible to eject one mode promptly while keeping the other mode inside the cavity. A projective measurement on the ejected mode results in probabilistic and heralded reduction of the stored mode into a quantum state through the quantum correlation. Once a quantum state is successfully created and stored in this way inside the memory cavity, it can be released on demand by quickly shifting the resonance of the shutter cavity. This scheme was first experimentally demonstrated for a heralded single-photon state, which we also describe here. |
