Abstract
Establishing quantum entanglement between individual nodes is crucial for building large-scale quantum networks, enabling secure quantum communications, distributed quantum computing, enhanced quantum metrology, and fundamental tests of quantum mechanics. However, the shared entanglements have been merely observed in either extremely low-temperature or well-isolated systems, which limits quantum networks for real-life applications. Here, we report the realization of heralding quantum entanglement between two atomic ensembles at room temperature, which are contained in two spatially separated, centimeter-sized vapor cells. By mapping the atomic state onto a photonic state after the readout process, we measure the quantum interference of the Raman-scattered photons and reconstruct the entangled state, then we strongly verify the existence of a single excitation delocalized in two atomic ensembles. The demonstrated building block paves the way to construct quantum networks and distributing entanglement across multiple remote nodes at ambient conditions.
Highlights
The development of quantum mechanics has built strong foundations for quantum entanglement in fundamental principles and experiments
We have reported the experimental realization of heralding quantum entanglement among billions of motional atoms separated by two glass cells, at low-noise, broadband and room-temperature regime
The achieved low-noise level delivers a high visibility of the quantum interference of the heralded entanglement between different anti-Stokes modes, as well as a tomography results of the joint entangled state of the two photonic qubits with high concurrence and fidelity
Summary
The development of quantum mechanics has built strong foundations for quantum entanglement in fundamental principles and experiments. The entanglement of photon retrieved from the ensembles, represented by state ΨAL,SR , is heralded by the detection of a single Stokes photon, whose density matrix ρAL,SR can be reconstructed by the measured statistics of correlated photons.
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