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A programmable qudit-based quantum processor.

Yulin Chi1, Jieshan Huang1, Zhanchuan Zhang1

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We developed a programmable quantum processor using qudits (quantum digits) on silicon-photonic chips. This technology enhances quantum computational parallelism for advanced quantum computing applications.

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Area of Science:

  • Quantum computing
  • Integrated photonics
  • Quantum information science

Background:

  • Quantum computing promises enhanced computational power but faces challenges with qubit stability and scalability.
  • Qudit-based quantum computing, using quantum digits beyond binary qubits, offers potential for increased information capacity and noise resilience.
  • Silicon-photonic integrated circuits provide a scalable platform for complex quantum functionalities.

Purpose of the Study:

  • To report a programmable qudit-based quantum processor integrated onto silicon-photonic circuits.
  • To demonstrate the enhancement of quantum computational parallelism using qudits.
  • To benchmark the processor's capabilities with fundamental quantum algorithms.

Main Methods:

  • Monolithic integration of initialization, manipulation, and measurement functionalities for ququart (four-level qudit) states.
  • Implementation of multi-value quantum-controlled logic gates with high fidelity.
  • Reprogramming the processor to execute quaternary quantum algorithms, including generalized Deutsch-Jozsa, Bernstein-Vazirani, phase estimation, and factorization.

Main Results:

  • Demonstration of a programmable qudit quantum processor with integrated functionalities.
  • High-fidelity operations on ququart states and multi-value quantum gates achieved.
  • Successful implementation and benchmarking of various quaternary quantum algorithms, showcasing enhanced parallelism.

Conclusions:

  • The developed silicon-photonic qudit processor offers enhanced capacity, accuracy, and efficiency for quantum computing.
  • Monolithic integration and high programmability pave the way for accelerating the development of large-scale quantum computers.
  • This work highlights the potential of integrated photonic qudit technology for advancing quantum information processing.