title: Coherent creation and destruction of orbital wavepackets in Si:P with electrical and optical read-out.
abstract: The ability to control dynamics of quantum states by optical interference, and subsequent electrical read-out, is crucial for solid state quantum technologies. Ramsey interference has been successfully observed for spins in silicon and nitrogen vacancy centres in diamond, and for orbital motion in InAs quantum dots. Here we demonstrate terahertz optical excitation, manipulation and destruction via Ramsey interference of orbital wavepackets in Si:P with electrical read-out. We show milliradian control over the wavefunction phase for the two-level system formed by the 1s and 2p states. The results have been verified by all-optical echo detection methods, sensitive only to coherent excitations in the sample. The experiments open a route to exploitation of donors in silicon for atom trap physics, with concomitant potential for quantum computing schemes, which rely on orbital superpositions to, for example, gate the magnetic exchange interactions between impurities.
authors: Advanced Technology Institute and SEPNet, University of Surrey, Guildford GU2 7XH, UK.
authors: K L
authors: KL
authors: Litvinenko
authors: Advanced Technology Institute and SEPNet, University of Surrey, Guildford GU2 7XH, UK.
authors: E T
authors: ET
authors: Bowyer
authors: London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1H 0AH, UK.
authors: P T
authors: PT
authors: Greenland
authors: Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7c, 6525 ED Nijmegen, The Netherlands.
authors: N
authors: N
authors: Stavrias
authors: Advanced Technology Institute and SEPNet, University of Surrey, Guildford GU2 7XH, UK.
authors: Juerong
authors: J
authors: Li
authors: Advanced Technology Institute and SEPNet, University of Surrey, Guildford GU2 7XH, UK.
authors: R
authors: R
authors: Gwilliam
authors: London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1H 0AH, UK.
authors: B J
authors: BJ
authors: Villis
authors: London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1H 0AH, UK.
authors: G
authors: G
authors: Matmon
authors: Advanced Technology Institute and SEPNet, University of Surrey, Guildford GU2 7XH, UK.
authors: M L Y
authors: ML
authors: Pang
authors: Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7c, 6525 ED Nijmegen, The Netherlands.
authors: B
authors: B
authors: Redlich
authors: Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7c, 6525 ED Nijmegen, The Netherlands.
authors: A F G
authors: AF
authors: van der Meer
authors: Institute of Photonics and Quantum Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS, UK.
authors: C R
authors: CR
authors: Pidgeon
authors: 1] London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1H 0AH, UK [2] Departments of Physics, ETH Zurich and EPF Lausanne and Paul Scherrer Institute, 5232 Villigen, Switzerland.
authors: G
authors: G
authors: Aeppli
authors: Advanced Technology Institute and SEPNet, University of Surrey, Guildford GU2 7XH, UK.
authors: B N
authors: BN
authors: Murdin