Abstract
Entanglement is one of the most vital properties of quantum mechanical systems, and it forms the backbone of quantum information technologies. Taking advantage of nano/microfabrication and particularly complementary metal-oxide-semiconductor manufacturing technologies, photonic integrated circuits (PICs) have emerged as a versatile platform for the generation, manipulation, and measurement of entangled photonic states. We summarize the recent progress of quantum entanglement on PICs, starting from the generation of nonentangled and entangled biphoton states, to the generation of entangled states of multiple photons, multiple dimensions, and multiple degrees of freedom, as well as their applications for quantum information processing.
Highlights
The famous Einstein–Podolsky–Rosen (EPR) state was originally proposed[1] and later named “entangled state”[2] for the debate of the completeness of the quantum mechanical description of reality
Leveraging mature complementary metal-oxide-semiconductor (CMOS) fabrication, integrated photonic quantum technology progressed significantly since its first demonstration in the controlled-NOT logic gate on silica waveguide circuits in 2008.20 This includes the development of advanced material systems,[20,21,22,23,24,25,26,27,28,29,30,31,32] implementations of major quantum communication protocols,[28,32,33] and proof-ofprinciple demonstrations of quantum computation and quantum simulation algorithms.[34,35,36]
We summarize the experimental progress of on-chip generation, manipulation, and measurement of entangled photonic states on integrated silicon-photonic quantum chips
Summary
The famous Einstein–Podolsky–Rosen (EPR) state was originally proposed[1] and later named “entangled state”[2] for the debate of the completeness of the quantum mechanical description of reality. Quantum computational advantages.[15] Universal quantum computing with photons is possible with largely entangled cluster states.[16,17,18] Integrated quantum photonics provides a compact, reliable, reprogrammable, and scalable platform for the study of fundamental quantum physics and for the implementation of profound quantum applications.[19] Leveraging mature complementary metal-oxide-semiconductor (CMOS) fabrication, integrated photonic quantum technology progressed significantly since its first demonstration in the controlled-NOT logic gate on silica waveguide circuits in 2008.20 This includes the development of advanced material systems,[20,21,22,23,24,25,26,27,28,29,30,31,32] implementations of major quantum communication protocols,[28,32,33] and proof-ofprinciple demonstrations of quantum computation and quantum simulation algorithms.[34,35,36] We recommend other reviews of those topics in Refs. We briefly review possible chip-scale applications with entangled states and discuss future challenges and opportunities
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