Cavity-assisted atomic Raman memories beyond the bad cavity limit: effect of four-wave mixing
arXiv:1807.11049 · doi:10.1103/PhysRevA.99.013814
Abstract
Quantum memories can be used not only for the storage of quantum information, but also for substantial manipulation of ensembles of quantum states. Therefore, the speed of such manipulation and the ability to write and retrieve the signals of relatively short duration becomes important. Previously there have been considered the limits on efficiency of the cavity-enhanced atomic Raman memories for the signals whose duration is not much larger than the cavity field lifetime, that is, beyond the bad cavity limit. We investigate in this work the four-wave mixing noise that arises by the retrieval of the relatively short signals from the cavity-assisted memories, thus complementing recent considerations by other authors, who mainly concentrated on the limit of large cavity decay rate. The four-wave mixing noise is commonly recognized as an important factor, able to prevent achieving a high memories quality in a variety of the atomic, solid state etc. implementations. The side-band noise sources (with respect to the quantized signal, supported by the cavity) play important role in the four-wave mixing. We propose an approach that allows one to account for the side-band quantum noise sources of different physical origin in the cavity-assisted atomic memories using a unified theoretical framework, based on a two-band spectral filtering of the noise sources. We demonstrate that in such spectrally-selective memories the side-band atomic noise sources essentially contribute to the four-wave mixing noise of the retrieved signal on a par with the side-band quantized field entering the cavity.
References in corpus (19)
- Quantum interface between light and atomic ensembles
- Quantum memories: emerging applications and recent advances
- Storage and retrieval of vector beams of light in a multiple-degree-of-freedom quantum memory
- Prospective applications of optical quantum memories
- Efficient and long-lived quantum memory with cold atoms inside a ring cavity
- Photon storage in Lambda-type optically dense atomic media. I. Cavity model
- A Cavity-Enhanced Room-Temperature Broadband Raman Memory
- Homodyne tomography of a single photon retrieved on demand from a cavity-enhanced cold atom memory
- Single-Photon Absorption in Coupled Atom-Cavity Systems
- Photonic qubits, qutrits and ququads accurately prepared and delivered on demand
- Fidelity of photon propagation in electromagnetically induced transparency in the presence of four-wave mixing
- Quantum memory for images - a quantum hologram
- Theory of noise suppression in Λ-type quantum memories by means of a cavity
- Electromagnetically induced transparency and four-wave mixing in a cold atomic ensemble with large optical depth
- Generation and delayed retrieval of spatially multimode Raman scattering in warm rubidium vapors
- Quantum storage based on the control field angular scanning
- Controlling the quantum state of a single photon emitted from a single polariton
- Multivariate quantum memory as controllable delayed multiport beamsplitter
- Suppression of Four-Wave Mixing in Hot Rubidium Vapor Using Ladder Scheme Raman Absorption