Deterministic photon-emitter coupling in chiral photonic circuits.

Engineering photon emission and scattering is central to modern photonics applications ranging from light harvesting to quantum-information processing. To this end, nanophotonic waveguides are well suited as they confine photons to a one-dimensional geometry and thereby increase the light-matter interaction. In a regular waveguide, a quantum emitter interacts equally with photons in either of the two propagation directions. This symmetry is violated in nanophotonic structures in which non-transversal local electric-field components imply that photon emission and scattering may become directional. Here we show that the helicity of the optical transition of a quantum emitter determines the direction of single-photon emission in a specially engineered photonic-crystal waveguide. We observe single-photon emission into the waveguide with a directionality that exceeds 90% under conditions in which practically all the emitted photons are coupled to the waveguide. The chiral light-matter interaction enables deterministic and highly directional photon emission for experimentally achievable on-chip non-reciprocal photonic elements. These may serve as key building blocks for single-photon optical diodes, transistors and deterministic quantum gates. Furthermore, chiral photonic circuits allow the dissipative preparation of entangled states of multiple emitters for experimentally achievable parameters, may lead to novel topological photon states and could be applied for directional steering of light.

[1]  H. Kimble,et al.  Scalable photonic quantum computation through cavity-assisted interactions. , 2004, Physical review letters.

[2]  Mohammad Hafezi,et al.  Robust optical delay lines with topological protection , 2011, 1102.3256.

[3]  Zohar Ringel,et al.  Topological States and adiabatic pumping in quasicrystals. , 2011, Physical review letters.

[4]  J. D. Thompson,et al.  Nanophotonic quantum phase switch with a single atom , 2014, Nature.

[5]  J. Song,et al.  Near-unity coupling efficiency of a quantum emitter to a photonic crystal waveguide. , 2014, Physical review letters.

[6]  A. Imamoğlu,et al.  Quantum-dot-spin single-photon interface. , 2010, Physical review letters.

[7]  D. E. Chang,et al.  A single-photon transistor using nanoscale surface plasmons , 2007, 0706.4335.

[8]  P. Lodahl,et al.  Interfacing single photons and single quantum dots with photonic nanostructures , 2013, 1312.1079.

[9]  P. Zoller,et al.  Driven-dissipative preparation of entangled states in cascaded quantum-optical networks , 2011, 1112.1690.

[10]  Io-Chun Hoi,et al.  Generation of nonclassical microwave states using an artificial atom in 1D open space. , 2012, Physical review letters.

[11]  L. Kuipers,et al.  Nanophotonic control of circular dipole emission , 2015, Nature Communications.

[12]  G. Leuchs,et al.  Polarization tailored light driven directional optical nanobeacon. , 2014, Nano letters.

[13]  A. Rauschenbeutel,et al.  Chiral nanophotonic waveguide interface based on spin-orbit interaction of light , 2014, Science.

[14]  Shanhui Fan,et al.  Input-output formalism for few-photon transport in one-dimensional nanophotonic waveguides coupled to a qubit , 2010, 1011.3296.

[15]  P. Zoller,et al.  Quantum spin dimers from chiral dissipation in cold-atom chains. , 2014, Physical review letters.

[16]  M. S. Skolnick,et al.  Interfacing spins in an InGaAs quantum dot to a semiconductor waveguide circuit using emitted photons. , 2013, Physical review letters.

[17]  S. Gsell,et al.  Deterministic coupling of a single silicon-vacancy color center to a photonic crystal cavity in diamond. , 2014, Nano letters.

[18]  Yuecheng Shen,et al.  Single-photon diode by exploiting the photon polarization in a waveguide. , 2011, Physical review letters.

[19]  H. Kimble,et al.  Atom–light interactions in photonic crystals , 2013, Nature Communications.

[20]  Christian Junge,et al.  Strong coupling between single atoms and non-transversal photons , 2013 .

[21]  Yoshihisa Yamamoto,et al.  Single-photon Devices and Applications , 2010 .

[22]  Matthew L. Baker,et al.  An atomic model of brome mosaic virus using direct electron detection and real-space optimization , 2014, Nature Communications.

[23]  Dirk Englund,et al.  Coherent spin control of a nanocavity-enhanced qubit in diamond , 2014, Nature Communications.

[24]  A. A. Gorbunov,et al.  Fine structure of neutral and charged excitons in self-assembled In(Ga)As/(Al)GaAs quantum dots , 2002 .

[25]  A. Rauschenbeutel,et al.  Quantum state-controlled directional spontaneous emission of photons into a nanophotonic waveguide , 2014, Nature Communications.

[26]  F. J. Rodríguez-Fortuño,et al.  Near-Field Interference for the Unidirectional Excitation of Electromagnetic Guided Modes , 2013, Science.