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  • Letter
  • Open Access

Realization of high-fidelity unitary operations on up to 64 frequency bins

Syamsundar De1,2, Vahid Ansari1,3, Jan Sperling4, Sonja Barkhofen1, Benjamin Brecht1,*, and Christine Silberhorn1

  • 1Integrated Quantum Optics Group, Institute for Photonic Quantum Systems (PhoQS), Paderborn University, 33098 Paderborn, Germany
  • 2Advanced Technology Development Centre, IIT Kharagpur, Kharagpur 721302, India
  • 3E. L. Ginzton Laboratory, Stanford University, 348 Via Pueblo Mall, Stanford, California 94305, USA
  • 4Theoretical Quantum Science, Institute for Photonic Quantum Systems (PhoQS), Paderborn University, 33098 Paderborn, Germany

  • *benjamin.brecht@upb.de
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Phys. Rev. Research 6, L022040 – Published 13 May, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L022040

Abstract

The ability to apply user-chosen large-scale unitary operations with high fidelity to a quantum state is key to realizing future photonic quantum technologies. Here, we realize the implementation of programmable unitary operations on up to 64 frequency-bin modes. To benchmark the performance of our system, we probe different quantum walk unitary operations, in particular, Grover walks on four-dimensional hypercubes with similarities exceeding 95% and quantum walks with 400 steps on circles and finite lines with similarities of 98%. Our results open a path toward implementing high-quality unitary operations, which can form the basis for applications in complex tasks, such as Gaussian boson sampling.

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Phys. Rev. Research 6, L022040– Published 13 May, 2024
  • Received 24 March 2023
  • Accepted 9 April 2024
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