Quantum Optics Seminar by Tim Schröder – University of Copenhagen

QUANTOP > Quantum Optics Calendar > Calendar 2015 > Quantum Optics Seminar...

Quantum Optics Seminar by Tim Schröder

Nanocavity Interfaces and Hybrid Photonic Integration of Spin Qubits in Diamond 

A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy spin memories (NV) [1], but scaling to larger networks requires more efficient spin-photon interfaces using optical resonators, and integration into complex photonic architectures. 

In this talk, we will discuss progress towards the development of such on-chip photonic integrated circuits (PICs) with multiple NV quantum memories entangled via photons. We will describe NV-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 µs [2-4]; implantation of NVs with nanometer-scale apertures [5], including into cavity field maxima [6]; hybrid on-chip networks for integration of multiple functional NV-cavity systems [7]; and scalable integration of superconducting nanowire single photon detectors on-chip [8]. 



[1].  H. Bernien, et al. Nature  497, 86, 2013; W. Pfaff et al. Science 345, 532, 2014.

[2].  L. Li, et al. Scientific Reports 5, 7802, 2015.

[3].  I. Bayn, S. Mouradian, et al, Applied Physics Letters , 105, 211101, 2014.

[4].  L. Li, T. Schröder, Edward H. Chen, et al. Nature Communications 6, 6173, 2015.

[5].  I. Bayn, E. H. Chen, M. E. Trusheim, et al., Nano Letters 15, 1751, 2015.

[6].  T. Schröder et al., In CLEO: 2014 , page FW1B.6. Optical Society of America, 2014.

[7].  S. Mouradian, T. Schröder, et al, Phys. Rev. X 5, 031009, 2015.

[8].  F. Najafi, J. Mower, N. C. Harris et al, Nature Communications, 6, 5873, 2015.