Ultrafast switching of photonic entanglement

Matthew A. Hall, Joseph B. Altepeter, Prem Kumar

Research output: Contribution to journalArticlepeer-review

99 Scopus citations


To deploy and operate a quantum network which utilizes existing telecommunications infrastructure, it is necessary to be able to route entangled photons at high speeds, with minimal loss and signal-band noise, and-most importantly-without disturbing the photons' quantum state. Here we present a switch which fulfills these requirements and characterize its performance at the single photon level. Furthermore, because this type of switch couples the temporal and spatial degrees of freedom, it provides an important new tool with which to encode multiple-qubit states in a single photon. As a proof-of-principle demonstration of this capability, we demultiplex a single quantum channel from a dual-channel, time-division-multiplexed entangled photon stream, effectively performing a controlled-bit-flip on a two-qubit subspace of a five-qubit, two-photon state.

Original languageEnglish (US)
Article number053901
JournalPhysical review letters
Issue number5
StatePublished - Feb 1 2011

ASJC Scopus subject areas

  • General Physics and Astronomy


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