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Coupling Two Laser-Cooled Ions via a Room-Temperature Conductor.

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Summary
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We show energy flow between two trapped ions separated by 620 micrometers using a metallic wire. This ion-wire-ion system enables tunable interactions for remote charge manipulation.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Materials science

Background:

  • Trapped ions are essential for quantum computing and sensing.
  • Mediating interactions between distant trapped ions is a significant challenge.
  • Current methods often require cryogenic temperatures or free-space coupling.

Purpose of the Study:

  • To demonstrate and characterize ion-ion coupling mediated by a room-temperature metallic wire.
  • To explore the potential of this system for remote quantum operations.
  • To investigate the influence of surface electric-field noise on quantum coherence.

Main Methods:

  • Utilizing two independently trapped ions with a separation of 620 micrometers.
  • Employing a room-temperature electrically floating metallic wire to connect the ion traps.
  • Tuning the motional states of both ions into resonance to observe energy flow.
  • Measuring the coupling rate and analyzing the impact of noise.

Main Results:

  • Successfully demonstrated energy flow between the two trapped ions with a coupling rate of 11 Hz.
  • The ion-wire-ion system facilitated enhanced ion-ion interaction at room temperature.
  • Strong surface electric-field noise was identified as a limiting factor for quantum-coherent coupling.

Conclusions:

  • Room-temperature conductors can mediate and tune interactions between independently trapped charges over extended distances.
  • The demonstrated ion-wire-ion system offers a novel approach for sympathetic cooling and entanglement of remote ions.
  • This technology has the potential to couple disparate physical systems, advancing quantum technologies.