On-chip distribution of quantum information using traveling phonons

Abstract

Distributing quantum entanglement on a chip is a crucial step towards realizing scalable quantum processors. Using traveling phonons - quantized guided mechanical wavepackets - as a medium to transmit quantum states is currently gaining significant attention, due to their small size and low propagation speed compared to other carriers, such as electrons or photons. Moreover, phonons are highly promising candidates to connect heterogeneous quantum systems on a chip, such as microwave and optical photons for long-distance transmission of quantum states via optical fibers. Here, we experimentally demonstrate the feasibility of distributing quantum information using phonons, by realizing quantum entanglement between two traveling phonons and creating a time-bin encoded traveling phononic qubit. The mechanical quantum state is generated in an optomechanical cavity and then launched into a phononic waveguide in which it propagates for around two hundred micrometers. We further show how the phononic, together with a photonic qubit, can be used to violate a Bell-type inequality.

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• Diamond Integrated Quantum Photonics: A Review
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• Optomechanical generation of coherent GHz vibrations in a phononic waveguide
• Deterministic multi-phonon entanglement between two mechanical resonators on separate substrates
• Mechanically-tunable bandgap closing in 2D graphene phononic crystals
• Multimode Phonon-Polaritons in Lead-Halide Perovskites in the Ultrastrong Coupling Regime
• Chemical potential and variable number of particles control the quantum state: Quantum oscillators as a showcase
• Hybrid spin-phonon architecture for scalable solid-state quantum nodes
• Time-resolved spectral diffusion of a multimode mechanical memory