Direct Observation of Broadband Nonclassical States in a Room-temperature Light-matter Interface
arXiv:1802.04898 · doi:10.1038/s41534-018-0083-1
Abstract
Nonclassical state is an essential resource for quantum-enhanced communication, computing and metrology to outperform their classical counterpart. The nonclassical states that can operate at high bandwidth and room temperature while being compatible with quantum memory are highly desirable to enable the scalability of quantum technologies. Here, we present a direct observation of broadband nonclasscal states in a room-temperature light-matter interface, where the atoms can also be controlled to store and interfere with photons. With a single coupling pulse and far off-resonance configuration, we are able to induce a multi-field interference between light and atoms to create the desired nonclassical states by spectrally selecting the two correlated photons out of seven possible emissions. We explicitly confirm the nonclassicality by observing a cross correlation up to 17 and a violation of Cauchy-Schwarz inequality with 568 standard deviations. Our results demonstrate the potential of a state-built-in, broadband and room-temperature light-matter interface for scalable quantum information networks.
arXiv comment10 pages, 6 figures
References in corpus (32)
- Long-distance quantum communication with atomic ensembles and linear optics
- Quantum Computing
- Photonic quantum technologies
- Quantum Communication
- Experimental demonstration of quantum memory for light
- Storage and retrieval of single photons transmitted between remote quantum memories
- Generation of Nonclassical Photon Pairs for Scalable Quantum Communication with Atomic Ensembles
- Multimode quantum memory based on atomic frequency combs
- High efficiency coherent optical memory with warm rubidium vapour
- A millisecond quantum memory for scalable quantum networks
- Photon Echoes Produced by Switching Electric Fields
- Single-Photon Generation from Stored Excitation in an Atomic Ensemble
- Heralded Single-Photon Emission from the Mollow Triplet Sidebands of a Quantum Dot
- Narrow Band Source of Transform-Limited Photon Pairs via Four-Wave Mixing in a Cold Atomic Ensemble
- Three-dimensional theory for interaction between atomic ensembles and free-space light
- Time-bin modulated polarization-entangled biphotons from cavity-enhanced down-conversion
- High-speed noise-free optical quantum memory
- On-chip low loss heralded source of pure single photons
- Subnatural-linewidth biphotons from a Doppler-broadened hot atomic vapor cell
- A Waveguide Frequency Converter Connecting Rubidium Based Quantum Memories to the Telecom C-Band
- Entanglement of light-shift compensated atomic spin waves with telecom light
- Multi-pulse addressing of a Raman quantum memory: configurable beam splitting and efficient readout
- Quantum study of information delay in electromagetically induced transparency
- Correlated photon pairs generated from a warm atomic ensemble
- Collisional decoherence during writing and reading quantum states
- High-Capacity Angularly-Multiplexed Holographic Memory Operating at the Single Photon Level
- A Broadband DLCZ Quantum Memory in Room-Temperature Atoms
- Quantum memory in warm rubidium vapor with buffer gas
- Ultra-low-noise room-temperature quantum memory for polarization qubits
- Non-classical correlations between a C-band telecom photon and a stored spin-wave
- Heralded single excitation of atomic ensemble via solid-state-based telecom photon detection
- High Efficiency Raman Memory by Suppressing Radiation Trapping