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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Quantum teleportation from a propagating photon to a solid-state spin qubit.

W B Gao1, P Fallahi, E Togan

  • 1Institute of Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland.

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|November 2, 2013
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Researchers demonstrate quantum teleportation, transferring quantum information from a photon to a semiconductor spin qubit. This breakthrough advances quantum networking and quantum information storage capabilities.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Solid-State Physics

Background:

  • Establishing a quantum interface between flying photonic qubits and stationary spin qubits is crucial for quantum networks.
  • Quantum teleportation offers a viable method for interfacing dissimilar quantum systems.

Purpose of the Study:

  • To experimentally demonstrate the transfer of quantum information from a photon to a semiconductor spin qubit via quantum teleportation.
  • To showcase the feasibility of creating a quantum interface between photons and solid-state spins.

Main Methods:

  • Generation of a single photon in a superposition state via resonant excitation of a neutral quantum dot.
  • Creation of an entangled spin-photon state in a second, spatially separated quantum dot.
  • Interference of photons from both quantum dots in a Hong-Ou-Mandel interferometer.
  • Verification of teleportation by measuring the spin state using optical spin-echo to extend coherence time.

Main Results:

  • Successful quantum teleportation of a photonic qubit onto a semiconductor spin qubit.
  • Achieved high photon indistinguishability, crucial for heralded teleportation.
  • Demonstrated the preservation and measurement of the transferred quantum information in the spin qubit.

Conclusions:

  • Experimental validation of quantum teleportation between photons and semiconductor spins.
  • Significant advancement in developing interfaces for quantum information transfer and storage.
  • Potential for scalable quantum networks and robust quantum computing architectures.