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Dr. Andrew Ramsay

Photo of Andrew Ramsay
Research Interests
Quantum dots: coherent control and spectroscopy

Quantum information
Email address
a.j.ramsay@sheffield.ac.uk
Office number
E13
Address
Department of Physics and Astronomy
University of Sheffield
Hicks Building
Hounsfield Road
Sheffield
S3 7RH
Phone number
+44 (0) 114 2223502

Publications

Papers

  • Two-colour photocurrent detection technique for coherent control of a single InGaAs/GaAs quantum dot
    S. J. Boyle, A. J. Ramsay, R. S. Kolodka, J. B. B. Oliviera, H. Y. Liu, M. Hopkinson, A. Mark Fox, M. S. Skolnick
    Physica Status Solidi C 246 4 824 (2009) http://www3.interscience.wiley.com/journal/121673422/abstract
  • Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole
    A.J. Ramsay, S.J. Boyle, T.M. Godden, R.S. Kolodka, A.F.A. Khatab, J.B.B. Oliveira, J. Skiba-Szymanska, H.-Y. Liu, M. Hopkinson, A.M. Fox, M.S. Skolnick
    Solid State Communications 149 1458 (2009) http://dx.doi.org/10.1016/j.ssc.2009.04.043
  • Beating of Exciton-Dressed States in a Single Semiconductor InGaAs/GaAs Quantum Dot
    S. J. Boyle, A. J. Ramsay, A. M. Fox, M. S. Skolnick, A. P. Heberle, and M. Hopkinson
    Physical Review Letters 102 207401 (2009) http://link.aps.org/abstract/PRL/v102/e207401
  • Two-qubit conditional quantum-logic operation in a single self-assembled quantum dot
    S. J. Boyle, A. J. Ramsay, F. Bello, H. Y. Liu, M. Hopkinson, A. M. Fox, and M. S. Skolnick
    Physical Review B 78 075301 (2008) http://link.aps.org/abstract/PRB/v78/e075301
  • Fast Optical Preparation, Control, and Readout of a Single Quantum Dot Spin
    A. J. Ramsay, S. J. Boyle, R. S. Kolodka, J. B. B. Oliviera, J. Skiba-Szymanska, H. Y. Liu, M. Hopkinson, A. M. Fox, and M. Skolnick
    Physical Review Letters 100 197401 (2008) http://link.aps.org/abstract/PRL/v100/e197401
  • Coherent control of single quantum dot exciton embedded in a photodiode
    R. S. Kolodka, A. J. Ramsay, P. W. Fry, W. K. Ng, A. Tahraoui, H. Y. Liu, M. Hopkinson, A. M. Fox, M. S. Skolnick
    Journal of Modern Optics 54 12 1717 (2007) http://www.informaworld.com/smpp/content~content=a779773919?jumptype=alert&alerttype=author,email
  • Coherent response of a quantum dot exciton driven by a rectangular spectrum optical pulse
    A. J. Ramsay, R. S. Kolodka, F. Bello, P. W. Fry, W. K. Ng, A. Tahraoui, H. Y. Liu, M. Hopkinson, D. M. Whittaker, A. M. Fox, and M. S. Skolnick
    Physical Review B 75 113302 (2007) http://link.aps.org/abstract/PRB/v75/e113302
  • Inversion recovery of single quantum-dot exciton based qubit
    R. S. Kolodka, A. J. Ramsay, J. Skiba-Szymanska, P. W. Fry, H. Y. Liu, A. M. Fox and M. S. Skolnick
    Physical Review B 75 193306 (2007) http://link.aps.org/abstract/PRB/v75/e193306

Conferences

  • Picosecond coherent control of dressed states in a single quantum dot
    S. J. Boyle, A. J. Ramsay, A. P. Heberle, M. Hopkinson, A. M. Fox, M. S. Skolnick
    Presented as a talk at One Day Quantum Dot Meeting, University of Sheffield, 13 January (2009)
  • Controlled-Rotation Quantum Logic Gate in a Single Self-Assembled Quantum Dot
    S.J. Boyle, A.J. Ramsay, H.Y. Liu, M. Hopkinson, A.M. Fox, M.S. Skolnick
    Presented as a poster at One Day Quantum Dot Meeting, Imperial College London, 11 January (2008)
  • Optically gated quantum logic operations with InGaAs/GaAs self-assembled quantum dots
    S. J. Boyle, A. J. Ramsay, R. S. Kolodka, H. Y. Liu, M. Hopkinson, A. M. Fox, and M. S. Skolnick
    Presented as a talk at The 5th International Conference on Semiconductor Quantum Dots, Gyeongju, Korea (2008) http://qd2008.snu.ac.kr/
  • Optically gated quantum logic operations in a single self-assembled quantum dot
    S. J. Boyle, A. J. Ramsay, R. S. Kolodka, J. B. B. Oliviera, F. Bello, H. Y. Liu, M. Hopkinson, A. M. Fox, M. S. Skolnick
    Presented as a talk at The 29th International Conference on the Physics of Semiconductors, Rio de Janeiro, Brazil (2008) http://www.icps2008.org/
  • Exciton/Polariton manipulation in semiconductor microstructures
    F. Bello, D.M. Whittaker, A.J. Ramsay, R. Kolodka, D. Sanvitto, F.P. Laussy
    Presented as a talk at QIPIRC conference/workshop (Oxford) (2007)
  • Absorption recovery of single quantum dot exciton
    R.S. Kolodka, A.J. Ramsay, J. Skiba-Szymanska, P.W. Fry, H.Y. Liu, A.M. Fox, and M.S. Skolnick
    Presented as a poster at One Day Quantum Dot Meeting in Nottingham, UK, January 19th (2007)
  • Influence of laser pulse on coherent properties of quantum dot
    R.S. Kolodka, A.J. Ramsay, J. Skiba-Szymanska, P.W. Fry, H.Y. Liu, A.M. Fox, and M.S. Skolnick
    Presented as a poster at One Day Quantum Dot Meeting in Nottingham, UK, January 19th (2007)
  • Lifetime-limited coherence time of single quantum dot photodiode based qubit
    R.S. Kolodka, A.J. Ramsay, P.W. Fry, H.Y. Liu, A.M. Fox, and M.S. Skolnick
    Presented as a poster at QIPIRC conference/workshop in Oxford, UK, June 25th–29th (2007)
  • Coherence dynamics of single quantum dot exciton embedded in photodiode
    R.S. Kolodka, A.J. Ramsay, J. Skiba-Szymanska, P.W. Fry, H.Y. Liu, A.M. Fox, and M.S. Skolnick
    Presented as a talk at Condensed Matter and Materials Physics (CMMP) conference in Leicester, UK, July 17th (2007)
  • Quantum control of single quantum dot qubits with electrical readout
    R.S. Kolodka, A.J. Ramsay, P.W. Fry, H.Y. Liu, A.M. Fox, and M.S. Skolnick
    Presented as a poster at 13th International Conference on Modulated Semiconductor Structures (MSS-13) in Genova, Italy, July 15th–20th (2007)
  • Quantum control of single quantum dot qubits with electrical readout
    R.S. Kolodka, A.J. Ramsay, P.W. Fry, H.Y. Liu, A.M. Fox, and M.S. Skolnick
    Presented as a poster at 13th International Conference on Modulated Semiconductor Structures (MSS-13) in Genova, Italy, July 15th–20th, 2007. (2007)
  • Ultrafast coherent control of single quantum dot qubit with electrical readout
    R.S. Kolodka, A.J. Ramsay, P.W. Fry, H.Y. Liu, A.M. Fox, and M.S. Skolnick
    Presented as a talk at Quantum Information Processing, Interdisciplinary Research Collaboration (QIPIRC) conference/workshop in Oxford, UK, June 25th–29th (2007)
  • Ultrafast coherent control of single quantum dot qubit with electrical readout
    R.S. Kolodka, A.J. Ramsay, P.W. Fry, H.Y. Liu, A.M. Fox, and M.S. Skolnick
    Presented as a talk at Quantum Information Processing, Interdisciplinary Research Collaboration (QIPIRC) conference/workshop in Oxford, UK, June 25th–29th (2007)
  • Electron tunnelling limited coherence time of single quantum dot photodiode based qubit
    R.S. Kolodka, A.J. Ramsay, J. Skiba-Szymanska, P.W. Fry, H.Y. Liu, D.M. Whittaker, A.M. Fox, and M.S. Skolnick
    Presented as a talk at Conference on Lasers and Electro-Optics (CLEO) and the Quantum Electronics and Laser Science Conference (QELS) in Baltimore, Maryland, USA, May 8th–10th, 2007. (2007)
  • Anatomy of a Rabi-flop of single ground-state quantum dot exciton
    R.S. Kolodka, A.J. Ramsay, P.W. Fry, M. Hopkinson, A.M. Fox and M.S. Skolnick
    Presented as a talk at IOP Quantum dot day, QinetiQ, Malvern UK, January 21st (2006)
  • Coherent control spectroscopy of single quantum dot ground-state neutral exciton
    R.S. Kolodka, A.J. Ramsay, P.W. Fry, F. Bello, W.K. Ng, A. Tahraoui, H.Y. Liu, A.M. Fox and M.S. Skolnick
    Presented as a poster at QIPIRC conference in Oxford, UK, June 26th–27th (2006)
  • Rabi-flopping of single ground-state quantum dot exciton
    A.J. Ramsay, R.S. Kolodka, P.W. Fry, A. Tahraoui, M. Hopkinson, A.M. Fox and M.S. Skolnick
    Presented as a talk at 14th International Conference on Quantum Dots, Chamonix-Mont Blanc, France, May 1st-5th (2006)
  • Coherent dynamics of single quantum dot exciton qubit driven by optical pulses with electrical readout
    R.S. Kolodka, A.J. Ramsay, F. Bello, P.W. Fry, W.K Ng, A. Tahraoui, H.Y. Liu, M. Hopkinson, D.M. Whittaker, A.M. Fox, and M.S. Skolnick
    Presented as a talk at Quantum Electronics and Photonics-13 (QEP) at Photon06 conference in Manchester, UK, September 4th–7th (2006)
  • Coherent dynamics of single quantum dot exciton qubit driven by detuned optical pulses with electrical readout
    A.J. Ramsay, R.S. Kolodka, F. Bello, P.W. Fry, W.K. Ng, A. Tahraoui, H.Y. Liu, M. Hopkinson, D.M. Whittaker, A.M. Fox and M.S. Skolnick
    Presented as a talk at 28th International Conference on the Physics of Semiconductors (ICPS) in Vienna, Austria, July 26th–28th (2006)
  • Time-resolved photocurrent technique for self- assembled quantum dots in photodiode
    R.S. Kolodka, A.J. Ramsay, M. Hopkinson, P.W. Fry, M.S. Skolnick and A.M. Fox
    Presented as a poster at QIPIRC conference in Oxford, UK, September 15th–16th (2005)