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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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A Schrödinger cat living in two boxes.

Chen Wang1, Yvonne Y Gao2, Philip Reinhold2

  • 1Department of Applied Physics and Physics, Yale University, New Haven, CT 06511, USA. chen.wang@yale.edu robert.schoelkopf@yale.edu.

Science (New York, N.Y.)
|May 28, 2016
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Summary
This summary is machine-generated.

Researchers created a complex quantum cat state in two microwave cavities, demonstrating entanglement between two distinct quantum systems. This advance is crucial for developing fault-tolerant quantum computation and communication.

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Area of Science:

  • Quantum physics
  • Quantum optics
  • Superconducting circuits

Background:

  • Schrödinger's cat paradox illustrates quantum superposition.
  • Quantum cat states in single harmonic oscillators demonstrate this paradox.
  • Previous work focused on single-mode systems.

Purpose of the Study:

  • To realize and characterize a two-mode quantum cat state.
  • To explore entanglement between two microwave cavities.
  • To advance quantum information processing capabilities.

Main Methods:

  • Utilized two microwave cavities linked by a superconducting artificial atom.
  • Performed full quantum state tomography.
  • Employed quantum nondemolition measurements of joint photon number parity.

Main Results:

  • Successfully created a two-mode cat state of electromagnetic fields.
  • Demonstrated entanglement between two single-cavity cat states.
  • Characterized a complex quantum state in a Hilbert space over 100 dimensions.

Conclusions:

  • The manipulation of multicavity quantum states is achievable.
  • This work supports logical operations for fault-tolerant quantum computation.
  • Enables advancements in quantum communication protocols.