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Researchers experimentally linked two quantum processors using a real-time classical connection. This enables error-mitigated dynamic circuits, creating larger, more versatile quantum states by overcoming hardware limitations.

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Area of Science:

  • Quantum Computing
  • Quantum Information Science

Background:

  • Current quantum hardware is limited by noisy qubits, short coherence times, and planar connectivity.
  • Many quantum applications require greater qubit connectivity and more qubits than available on a single quantum processing unit (QPU).
  • Connecting multiple QPUs via classical communication is a proposed solution but lacks experimental proof.

Purpose of the Study:

  • To experimentally demonstrate the creation of quantum states requiring periodic connectivity using multiple QPUs.
  • To validate the use of error-mitigated dynamic circuits and circuit cutting for enhanced quantum computation.
  • To establish a real-time classical link between QPUs for conditional quantum gate operations.

Main Methods:

  • Implemented error-mitigated dynamic circuits with mid-circuit measurement-based classical control.
  • Utilized circuit cutting to construct quantum states across multiple quantum processing units (QPUs).
  • Established a real-time classical link connecting two QPUs (127 qubits each) to enable inter-QPU conditional operations.

Main Results:

  • Successfully created quantum states requiring periodic connectivity using up to 142 qubits across two QPUs.
  • Demonstrated real-time conditional quantum gate operations between QPUs based on measurement outcomes.
  • Showcased enhanced qubit connectivity and instruction sets through error-mitigated control flow.

Conclusions:

  • Multiple quantum processors can be integrated and utilized as a single, more powerful quantum computer.
  • Error-mitigated dynamic circuits, enabled by real-time classical links, significantly enhance quantum computing versatility and scalability.
  • This experimental realization paves the way for tackling complex quantum problems previously intractable due to hardware constraints.