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The Entropy as a State Function01:14

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Consider an arbitrary process that moves between two specific states (A and B) in a cyclic manner. This process is reversible and broken down into smaller parts that each follow a Carnot cycle. A Carnot cycle has two isothermal (constant temperature) processes. During these processes, the ratio of the amount of heat transferred to their respective temperature remains constant. The other two processes in the Carnot cycle are also reversible but adiabatic, which means they occur without any heat...
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Quantum Entanglement Swapping between Two Multipartite Entangled States.

Xiaolong Su1,2, Caixing Tian1,2, Xiaowei Deng1,2

  • 1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, People's Republic of China.

Physical Review Letters
|December 24, 2016
PubMed
Summary
This summary is machine-generated.

This study demonstrates quantum entanglement swapping between multipartite entangled states, merging them into a larger entangled system. This technique is crucial for building advanced quantum networks and future quantum communication systems.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Communication

Background:

  • Quantum entanglement swapping is key for connecting quantum nodes.
  • Multipartite entangled states are essential for advanced quantum protocols.

Purpose of the Study:

  • To experimentally demonstrate entanglement swapping between two independent multipartite entangled states.
  • To merge independent tripartite Greenberger-Horne-Zeilinger (GHZ) states into a larger entangled state.
  • To investigate entanglement swapping with a GHZ and an Einstein-Podolsky-Rosen state.

Main Methods:

  • Deterministic entanglement swapping using joint measurements.
  • Classical feedforward of measurement results.
  • Experimental demonstration with optical fields.

Main Results:

  • Successfully merged two independent tripartite GHZ states into a single large entangled state.
  • Demonstrated entanglement swapping between a tripartite GHZ state and an Einstein-Podolsky-Rosen entangled state.
  • Investigated the impact of transmission loss on the resulting entanglement.

Conclusions:

  • The experiment provides a feasible technical reference for constructing complex quantum networks.
  • Entanglement swapping is a viable method for creating larger, interconnected quantum systems.
  • This work advances the development of quantum communication infrastructure.