A nondestructive Bell-state measurement on two distant atomic qubits
arXiv:2409.00871 · doi:10.1038/s41566-021-00802-1
Abstract
One of the most fascinating aspects of quantum networks is their capability to distribute entanglement as a nonlocal communication resource. In a first step, this requires network-ready devices that can generate and store entangled states. Another crucial step, however, is to develop measurement techniques that allow for entanglement detection. Demonstrations for different platforms suffer from being either not complete, or destructive, or local. Here we demonstrate a complete and nondestructive measurement scheme that always projects any initial state of two spatially separated network nodes onto a maximally entangled state. Each node consists of an atom trapped inside an optical resonator from which two photons are successively reflected. Polarisation measurements on the photons discriminate between the four maximally entangled states. Remarkably, such states are not destroyed by our measurement. In the future, our technique might serve to probe the decay of entanglement and to stabilise it against dephasing via repeated measurements.
References in corpus (21)
- The Quantum Internet
- Heralded entanglement between solid-state qubits separated by 3 meters
- Observation of three-photon Greenberger-Horne-Zeilinger entanglement
- Advances in Quantum Teleportation
- Scalable photonic quantum computation through cavity-assisted interaction
- Measurement-Induced Entanglement for Excitation Stored in Remote Atomic Ensembles
- On Bell measurements for teleportation
- A Quantum Gate between a Flying Optical Photon and a Single Trapped Atom
- Measuring measurement
- Quantum Zeno dynamics: mathematical and physical aspects
- A photon-photon quantum gate based on a single atom in an optical resonator
- Generation of heralded entanglement between distant hole spins
- A symmetry analyser for non-destructive Bell state detection using EIT
- Deterministic teleportation of a quantum gate between two logical qubits
- Efficient Teleportation between Remote Single-Atom Quantum Memories
- A Quantum-Logic Gate between Distant Quantum-Network Modules
- A Photon-Photon Quantum Gate Based on Rydberg Interactions
- Quantum gate teleportation between separated qubits in a trapped-ion processor
- Experimental realization of nondestructive discrimination of Bell states using a five-qubit quantum computer
- Long-distance atom-photon entanglement
- Entangling spins by measuring charge: a parity-gate toolbox
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- Method to deterministically generate large-amplitude optical cat states
- Full Bell-basis measurement of an atom-photon 2-qubit state and its application for quantum networks
- Robust atom-photon gate for quantum information processing
- Hybrid Quantum Repeaters with Ensemble-based Quantum Memories and Single-spin Photon Transducers
- Efficient Quantum Repeater with Single Atoms in Cavities
- Enhancing the efficiency of quantum measurement-based engines with entangling measurements
- Nondestructive discrimination of Bell states between distant parties