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Related Experiment Video

Updated: Jun 21, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Heralded quantum gate between remote quantum memories.

P Maunz1, S Olmschenk, D Hayes

  • 1Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742, USA. pmaunz@umd.edu

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

We created a quantum gate using two distant ytterbium ions and photon interference. This breakthrough enables scalable quantum computing through entangled cluster states.

Related Experiment Videos

Last Updated: Jun 21, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Scalable quantum computing requires reliable entanglement between distant qubits.
  • Trapped ions offer a promising platform for quantum information processing due to their long coherence times and controllability.
  • Photonic interconnects are crucial for mediating interactions between spatially separated quantum systems.

Purpose of the Study:

  • To demonstrate a probabilistic entangling quantum gate between two distant trapped ytterbium ions.
  • To utilize photonic interference for mediating quantum gates between atomic qubits.
  • To assess the feasibility of generating large entangled cluster states for scalable quantum computing.

Main Methods:

  • Implementing a quantum gate between hyperfine clock state qubits of two trapped ytterbium ions.
  • Mediating the entanglement via the interference of two photons, each carrying a frequency-encoded qubit.
  • Heralding the successful gate operation through coincidence detection of the emitted photons.

Main Results:

  • Achieved a probabilistic entangling quantum gate between two distant trapped ytterbium ions.
  • Demonstrated an average output state fidelity of 89+/-2% for the entangling gate.
  • Showcased the potential for generating large entangled cluster states when combined with single-qubit operations.

Conclusions:

  • The demonstrated photonic-mediated entangling gate is a significant step towards scalable quantum computing.
  • This method provides a viable pathway for creating robust entangled states between distant qubits.
  • The results pave the way for building larger quantum processors using trapped ions and photonic interconnects.