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<p>Quantum interconnects facilitate entanglement distribution between non-local computational nodes in a quantum network. For superconducting processors, microwave photons are a natural means to mediate this distribution. However, many existing architectures limit node connectivity and directionality. In this work, we construct a chiral quantum interconnect between two nominally identical modules in separate microwave packages. Our approach uses quantum interference to emit and absorb microwave photons on demand and in a chosen direction between these modules. We optimize our protocol using model-free reinforcement learning to maximize the absorption efficiency. By halting the emission process halfway through its duration, we generate remote entanglement between modules in the form of a four-qubit <i>W</i> state with approximately 62% fidelity in each direction, limited mainly by propagation loss. This quantum network architecture enables all-to-all connectivity between non-local processors for modular and extensible quantum simulation and computation.</p>

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Deterministic remote entanglement using a chiral quantum interconnect

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • Aziza Almanakly,
  • Beatriz Yankelevich,
  • Max Hays,
  • Bharath Kannan,
  • Réouven Assouly,
  • Alex Greene,
  • Michael Gingras,
  • Bethany M. Niedzielski,
  • Hannah Stickler,
  • Mollie E. Schwartz,
  • Kyle Serniak,
  • Joel Î-j. Wang,
  • Terry P. Orlando,
  • Simon Gustavsson,
  • Jeffrey A. Grover,
  • William D. Oliver

摘要

Quantum interconnects facilitate entanglement distribution between non-local computational nodes in a quantum network. For superconducting processors, microwave photons are a natural means to mediate this distribution. However, many existing architectures limit node connectivity and directionality. In this work, we construct a chiral quantum interconnect between two nominally identical modules in separate microwave packages. Our approach uses quantum interference to emit and absorb microwave photons on demand and in a chosen direction between these modules. We optimize our protocol using model-free reinforcement learning to maximize the absorption efficiency. By halting the emission process halfway through its duration, we generate remote entanglement between modules in the form of a four-qubit W state with approximately 62% fidelity in each direction, limited mainly by propagation loss. This quantum network architecture enables all-to-all connectivity between non-local processors for modular and extensible quantum simulation and computation.