Research Abstract


Programmable multimode quantum networks

2012年8月28日 Nature Communications 3 : 1026 doi: 10.1038/ncomms2033


Seiji Armstrong1,2,3, Jean-François Morizur1,4, Jiri Janousek1,2, Boris Hage1,2, Nicolas Treps4, Ping Koy Lam1,2 & Hans-A. Bachor1

  1. オーストラリア国立大学 Australian Centre for Quantum-Atom Optics, Department of Quantum Science
  2. オーストラリア国立大学 Centre for Quantum Computation and Communication Technology, Department of Quantum Science
  3. 東京大学大学院 工学系研究科 物理工学専攻
  4. ピエール・マリー・キュリー大学(フランス)
Entanglement between large numbers of quantum modes is the quintessential resource for future technologies such as the quantum internet. Conventionally, the generation of multimode entanglement in optics requires complex layouts of beamsplitters and phase shifters in order to transform the input modes into entangled modes. Here we report the highly versatile and efficient generation of various multimode entangled states with the ability to switch between different linear optics networks in real time. By defining our modes to be combinations of different spatial regions of one beam, we may use just one pair of multi-pixel detectors in order to measure multiple entangled modes. We programme virtual networks that are fully equivalent to the physical linear optics networks they are emulating. We present results for N=2 up to N=8 entangled modes here, including N=2, 3, 4 cluster states. Our approach introduces the highly sought after attributes of flexibility and scalability to multimode entanglement.