Generating entangled microwave radiation over two transmission lines.

Physical review letters · 2012 · Benefit · Insufficient evidence

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BenefitInsufficient evidencePaper 6519

Study snapshot

PublicationPhysical review letters · 2012

Study typeengineering

Reported directionBenefit

Evidence ratingInsufficient

Abstract

Using a superconducting circuit, the Josephson mixer, we demonstrate the first experimental realization of spatially separated two-mode squeezed states of microwave light. Driven by a pump tone, a first Josephson mixer generates, out of quantum vacuum, a pair of entangled fields at different frequencies on separate transmission lines. A second mixer, driven by a π-phase shifted copy of the first pump tone, recombines and disentangles the two fields. The resulting output noise level is measured to be lower than for the vacuum state at the input of the second mixer, an unambiguous proof of entanglement. Moreover, the output noise level provides a direct, quantitative measure of entanglement, leading here to the demonstration of 6 Mebit · s(-1) (mega entangled bits per second) generated by the first mixer.

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AI evidence extraction

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Study typeengineering

Effect directionbenefit

PopulationNot supplied

Sample sizeNot supplied

Exposuremicrowave

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

A superconducting Josephson mixer generated spatially separated two-mode squeezed (entangled) microwave fields at different frequencies on separate transmission lines. A second mixer recombined/disentangled the fields, and the measured output noise level below the vacuum level at the second mixer input was reported as unambiguous proof of entanglement, with a demonstrated generation rate of 6 Mebit·s^-1.

Outcomes measured

Generation of spatially separated two-mode squeezed microwave states
Entanglement between fields on separate transmission lines
Output noise level below vacuum as evidence/measure of entanglement
Entanglement generation rate (Mebit·s^-1)

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "microwave",
    "source": "superconducting circuit (Josephson mixer) over transmission lines",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Generation of spatially separated two-mode squeezed microwave states",
    "Entanglement between fields on separate transmission lines",
    "Output noise level below vacuum as evidence/measure of entanglement",
    "Entanglement generation rate (Mebit·s^-1)"
  ],
  "main_findings": "A superconducting Josephson mixer generated spatially separated two-mode squeezed (entangled) microwave fields at different frequencies on separate transmission lines. A second mixer recombined/disentangled the fields, and the measured output noise level below the vacuum level at the second mixer input was reported as unambiguous proof of entanglement, with a demonstrated generation rate of 6 Mebit·s^-1.",
  "effect_direction": "benefit",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "Josephson mixer",
    "superconducting circuit",
    "two-mode squeezed states",
    "entanglement",
    "transmission lines",
    "quantum vacuum",
    "noise measurement"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1103/physrevlett.109.183901
PubMed: 23215279

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