Temporally multiplexed ion-photon quantum interface via fast ion-chain transport

Abstract

High-rate remote entanglement between photon and matter-based qubits is essential for distributed quantum information processing. A key technique to increase the modest entangling rates of existing long-distance quantum networking approaches is multiplexing. Here, we demonstrate a temporally multiplexed ion-photon interface via rapid transport of a chain of nine calcium ions across 74 $\mu \mathrm{m}$ within 86 $\mu \mathrm{s}$. The non-classical nature of the multiplexed photons is verified by measuring the second-order correlation function with an average value of $g^{(2)}(0)$ = 0.060(13), indicating negligible crosstalk between the multiplexed modes. In addition, we characterize the motional degree-of-freedom of the ion crystal after transport and find that it is coherently excited to as much as ${\bar{n}}_{\alpha }\approx 110$ for the center-of-mass mode. Our proof-of-principle implementation paves the way for large-scale quantum networking with trapped ions, but highlights some challenges that must be overcome.

6 pages, 4 figures

References in corpus (19)

• The Quantum Internet
• A Race Track Trapped-Ion Quantum Processor
• Single ion-qubit exceeding one hour coherence time
• Entangling single atoms over 33 km telecom fibre
• Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells
• A quantum network of entangled optical atomic clocks
• Quantum networks with neutral atom processing nodes
• A telecom-wavelength quantum repeater node based on a trapped-ion processor
• Towards a deterministic interface between trapped-ion qubits and travelling photons
• Robust Quantum Memory in a Trapped-Ion Quantum Network Node
• Multiplexed telecom-band quantum networking with atom arrays in optical cavities
• Efficient polarisation-preserving frequency conversion from a trapped-ion-compatible wavelength to the telecom C band
• Multiplexed quantum repeaters based on dual-species trapped-ion systems
• Fast photon-mediated entanglement of continuously-cooled trapped ions for quantum networking
• Invariant-based inverse engineering of time-dependent, coupled harmonic oscillators
• Fast delivery of heralded atom-photon quantum correlation over 12km fiber through multiplexing enhancement
• A building block of quantum repeaters for scalable quantum networks
• Test of Causal Non-Linear Quantum Mechanics by Ramsey Interferometry on the Vibrational Mode of a Trapped Ion
• RF-induced heating dynamics of non-crystallized trapped ions

Cited by in corpus (1)

• Atomic fluorescence collection into planar photonic devices