Experimental protocol for high-fidelity heralded photon-to-atom quantum state transfer

Abstract

A quantum network combines the benefits of quantum systems regarding secure information transmission and calculational speed-up by employing quantum coherence and entanglement to store, transmit, and process information. A promising platform for implementing such a network are atom-based quantum memories and processors, interconnected by photonic quantum channels. A crucial building block in this scenario is the conversion of quantum states between single photons and single atoms through controlled emission and absorption. Here we present an experimental protocol for photon-to-atom quantum state conversion, whereby the polarization state of an absorbed photon is mapped onto the spin state of a single absorbing atom with >95% fidelity, while successful conversion is heralded by a single emitted photon. Heralded high-fidelity conversion without affecting the converted state is a main experimental challenge, in order to make the transferred information reliably available for further operations. We record >80/s successful state transfer events out of 18,000/s repetitions.

6 pages, 8 figures

References in corpus (13)

• The Quantum Internet
• Quantum computing with trapped ions
• An Elementary Quantum Network of Single Atoms in Optical Cavities
• Quantum teleportation using active feed-forward between two Canary Islands
• Towards fault-tolerant quantum computing with trapped ions
• A Single-Atom Quantum Memory
• Reversible state transfer between light and a single trapped atom
• Ion traps with enhanced optical and physical access
• A tunable narrowband entangled photon pair source for resonant single-photon single-atom interaction
• Quantum interference from remotely trapped ions
• Precision measurement of the branching fractions of the 4P3/2 decay of Ca II
• Efficient saturation of an ion in free space
• Heralded single-magnon quantum memory for photon polarization states

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