Entanglement-preserving photonic switching: Full cross-bar operation with quantum data streams

Neal N. Oza, Yu Ping Huang, Prem Kumar

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


As the field of quantum communications matures and adopts larger network topologies, it will require switches capable of multiplexing and demultiplexing entangled photons between network nodes. Such switches will need to operate at high speeds, with low loss, and minimal signal-band noise, while also retaining the quantum state of the routed photons. We present an all-optical, fiber-based, dual-in, dual-out switch that has a switching window of 45 ps and an insertion loss of <3.0 dB. In addition, the switch introduces minimal degradation (<1.5) to the quantum state of the routed entangled photons. As a test of the switch's utility, we demultiplex a single quantum channel from a 6.5-GHz dual-channel quantum data stream. The recovered quantum state exhibits a fidelity of 96.2± 1.2 with the prepared state.

Original languageEnglish (US)
Article number6678557
Pages (from-to)356-359
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number4
StatePublished - Feb 15 2014


  • Quantum communications
  • crossphase modulation
  • nonlinear optical loop mirror
  • optical fiber communication
  • optical switches

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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