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Entanglement of single-atom quantum bits at a distance
D L Moehring1, P Maunz, S Olmschenk
1FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA. david.moehring@mpq.mpg.de
Nature
|September 7, 2007
Summary
Researchers entangled two single-atom quantum memories separated by one meter using photons. This breakthrough advances scalable quantum information processing and quantum computing applications.
Area of Science:
- Quantum Information Science
- Atomic Physics
- Quantum Optics
Background:
- Quantum information science leverages quantum phenomena like superposition and entanglement for enhanced computation.
- Stable quantum memories (qubits) and efficient information transfer are crucial for large-scale quantum processors.
- Photons are ideal for distributing quantum information over distances, while atoms serve as excellent quantum memories.
Purpose of the Study:
- To demonstrate entanglement between two fixed single-atom quantum memories separated by a macroscopic distance.
- To establish a method for creating entanglement between remote, individual atomic qubits.
- To assess the feasibility of this method for scalable quantum information applications.
Main Methods:
- Utilized trapped atomic ions as single-atom quantum memories.
- Emitted single photons from two remotely located trapped atomic ions.
- Interfered and detected the emitted photons to signal entanglement between the atomic qubits.
- Characterized the entangled pair by measuring qubit correlations with high detection efficiency.
Main Results:
- Successfully demonstrated entanglement between two single-atom quantum memories separated by one meter.
- Achieved near-perfect detection efficiency in characterizing the entangled qubit correlations.
- Confirmed the interference and detection of photons as a reliable indicator of atomic qubit entanglement.
Conclusions:
- The demonstrated method provides a viable pathway for entangling remote, fixed single-atom qubits.
- This probabilistic entanglement technique is suitable for integration into scalable quantum information processing architectures.
- The work represents a significant step towards building distributed quantum computers and networks.
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