Over the last decade there has been a continuing interest in slow and stored light based on the electromagnetically
induced transparency (EIT) effect, because of their potential applications in quantum information manipulation.
However, previous experimental works all dealt with the single-component slow light which cannot be employed as a
qubit. In this work, we report the first experimental demonstration of two-component or spinor slow light (SSL) using a
double tripod (DT) atom-light coupling scheme. The oscillations between the two components, similar to the Rabi
oscillation of a two-level system or a qubit, were observed. Single-photon SSL can be considered as two-color qubits.
We experimentally demonstrated a possible application of the DT scheme as quantum memory and quantum rotator for
the two-color qubits. This work opens up a new direction in the slow light research.
A high-storage efficiency and long-live quantum memory for photons is an essential component for the information processing in long-distance quantum communication and optical quantum computation. We demonstrated a 78% storage efficiency (SE) of coherent light pulses with a cold atomic medium based on the effect of electromagnetically induced transparency (EIT). We also obtained a large fractional delay of 74 at 50% SE, which is the best record to date. The measured fidelity of the memory is better than 90%. The results suggest the EIT light-matter interface can be readily applied to single-photon quantum states. Our work greatly advances the technology of EIT-based quantum memory for the practical quantum information applications.
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