Dr Sarah Croke
- Lecturer (Physics & Astronomy)
telephone: 0141 330 4717
email: Sarah.Croke@glasgow.ac.uk
Research interests
I joined the University of Glasgow as a lecturer in September 2013, trading the cold winters of Canada for the comparatively warmer climes of the West of Scotland. I was very happy to have the opportunity to return to Glasgow, where I completed my PhD at the University of Strathclyde in 2007. In the interim I spent almost 6 years in the lovely Waterloo, Ontario, at the Perimeter Institute, where I was first a postdoctoral fellow and later a PSI fellow. My main research interests are in quantum information and quantum measurement, motivated by the fact that I remain somewhat puzzled by quantum theory. My current research focuses on quantum information protocols that require only a small quantum processor, and thus may be implementable with current or near future technology. Quantum information is a broad and interdisciplinary field sitting somewhere at the boundary between mathematics, computer science, and theoretical and experimental physics. Working in this field I have enjoyed learning parts of all of these, but remain a physicist, and am most interested in the interface between theoretical and experimental aspects of the field. I still hope to some day understand what quantum theory is trying to tell us about the world.
Publications
2018
Flatt, K., Croke, S. and Barnett, S. M. (2018) Two-time state formalism for quantum eavesdropping. Physical Review A: Atomic, Molecular and Optical Physics, (Accepted for Publication)
Vaccaro, J., Croke, S. and Barnett, S. (2018) Is coherence catalytic? Journal of Physics A: Mathematical and Theoretical, 51, 414008. (doi:10.1088/1751-8121/aac112/)
Weir, G., Hughes, C., Barnett, S. M. and Croke, S. (2018) Optimal measurement strategies for the trine states with arbitrary prior probabilities. Quantum Science and Technology, 3(3), 035003. (doi:10.1088/2058-9565/aabc68)
2017
Flatt, K., Barnett, S. M. and Croke, S. (2017) Gleason-Busch theorem for sequential measurements. Physical Review A: Atomic, Molecular and Optical Physics, 96(6), 062125. (doi:10.1103/PhysRevA.96.062125)
Weir, G., Barnett, S. M. and Croke, S. (2017) Optimal discrimination of single-qubit mixed states. Physical Review A: Atomic, Molecular and Optical Physics, 96(2), 022312. (doi:10.1103/PhysRevA.96.022312)
Ritboon, A., Croke, S. and Barnett, S. (2017) Proposed optical realisation of a two photon, four-qubit entangled χ state. Journal of Optics, 19(7), 075201. (doi:10.1088/2040-8986/aa72af)
Croke, S., Barnett, S. M. and Weir, G. (2017) Optimal sequential measurements for bipartite state discrimination. Physical Review A: Atomic, Molecular and Optical Physics, 95(5), 052308. (doi:10.1103/PhysRevA.95.052308)
Trautmann, N., Ferenczi, G., Croke, S. and Barnett, S. M. (2017) Holographic quantum imaging: reconstructing spatial properties via two-particle interference. Journal of Optics, 19(5), 054005. (doi:10.1088/2040-8986/aa67b6)
Croke, S. and Barnett, S. M. (2017) Difficulty of distinguishing product states locally. Physical Review A: Atomic, Molecular and Optical Physics, 95(1), 012337. (doi:10.1103/PhysRevA.95.012337)
2015
Croke, S. (2015) PT-symmetric Hamiltonians and their application in quantum information. Physical Review A: Atomic, Molecular and Optical Physics, 91(5), 052113. (doi:10.1103/PhysRevA.91.052113)
2014
Blume-Kohout, R., Croke, S. and Gottesman, D. (2014) Streaming universal distortion-free entanglement concentration. IEEE Transactions on Information Theory, 60(1), pp. 334-350. (doi:10.1109/TIT.2013.2292135)
2013
Blume-Kohout, R., Croke, S. and Zwolak, M. (2013) Quantum data gathering. Scientific Reports, 3(1800), (doi:10.1038/srep01800)
2012
Gottesman, D., Jennewein, T. and Croke, S. (2012) Longer-baseline telescopes using quantum repeaters. Physical Review Letters, 109(7), Art. 070503. (doi:10.1103/PhysRevLett.109.070503)
Croke, S. and Kent, A. (2012) Security details for bit commitment by transmitting measurement outcomes. Physical Review A: Atomic, Molecular and Optical Physics, 86(5), 052309. (doi:10.1103/PhysRevA.86.052309)
2010
Croke, S.M., O'Sullivan, S.P. and Gabuzda, D.C. (2010) The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk 501 at 8.4-1.6 GHz. Monthly Notices of the Royal Astronomical Society, 402(1), pp. 259-270. (doi:10.1111/j.1365-2966.2009.15923.x)
Lu, Y., Coish, N., Kaltenbaek, R., Hamel, D.R., Croke, S. and Resch, K.J. (2010) Minimum-error discrimination of entangled quantum states. Physical Review A: Atomic, Molecular and Optical Physics, 82(4), 042340. (doi:10.1103/PhysRevA.82.042340)
McEndoo, S., Croke, S., Brophy, J. and Busch, T. (2010) Phase evolution in spatial dark states. Physical Review A: Atomic, Molecular and Optical Physics, 81(4), 043640. (doi:10.1103/PhysRevA.81.043640)
2009
Barnett, S.M. and Croke, S. (2009) On the conditions for discrimination between quantum states with minimum error. Journal of Physics A: Mathematical and Theoretical, 42(6), 062001. (doi:10.1088/1751-8113/42/6/062001)
Barnett, S.M. and Croke, S. (2009) Quantum state discrimination. Advances in Optics and Photonics, 1(2), pp. 238-278. (doi:10.1364/AOP.1.000238)
2008
Croke, S.M. and Gabuzda, D.C. (2008) Aligning VLBI images of active galactic nuclei at different frequencies. Monthly Notices of the Royal Astronomical Society, 386(2), pp. 619-626. (doi:10.1111/j.1365-2966.2008.13087.x)
Croke, S., Barnett, S.M. and Stenholm, S. (2008) Linear transformations of quantum states. Annals of Physics, 323(4), pp. 893-906. (doi:10.1016/j.aop.2007.06.001)
Croke, S., Andersson, E. and Barnett, S.M. (2008) No-signaling bound on quantum state discrimination. Physical Review A: Atomic, Molecular and Optical Physics, 77(1), 012113. (doi:10.1103/PhysRevA.77.012113)
2007
Croke, S., Mosley, P.J., Barnett, S.M. and Walmsley, I.A. (2007) Maximum confidence measurements and their optical implementation. European Physical Journal D, 41(3), pp. 589-598. (doi:10.1140/epjd/e2006-00265-1)
2006
Croke, S., Andersson, E., Barnett, S.M. , Gilson, C.R. and Jeffers, J. (2006) Maximum confidence quantum measurements. Physical Review Letters, 96(7), 070401. (doi:10.1103/PhysRevLett.96.070401)
Mosley, P., Croke, S., Walmsley, I. and Barnett, S.M. (2006) Experimental realization of maximum confidence quantum state discrimination for the extraction of quantum information. Physical Review Letters, 97(19), p. 193601. (doi:10.1103/PhysRevLett.97.193601)
2005
Croke, S., Charlot, P., Gabuzda, D. and Sol, H. (2005) Multi-frequency multi-epoch VLBA polarization observations of MRK 501. Baltic Astronomy, 14(3), pp. 367-370.
Articles
Flatt, K., Croke, S. and Barnett, S. M. (2018) Two-time state formalism for quantum eavesdropping. Physical Review A: Atomic, Molecular and Optical Physics, (Accepted for Publication)
Vaccaro, J., Croke, S. and Barnett, S. (2018) Is coherence catalytic? Journal of Physics A: Mathematical and Theoretical, 51, 414008. (doi:10.1088/1751-8121/aac112/)
Weir, G., Hughes, C., Barnett, S. M. and Croke, S. (2018) Optimal measurement strategies for the trine states with arbitrary prior probabilities. Quantum Science and Technology, 3(3), 035003. (doi:10.1088/2058-9565/aabc68)
Flatt, K., Barnett, S. M. and Croke, S. (2017) Gleason-Busch theorem for sequential measurements. Physical Review A: Atomic, Molecular and Optical Physics, 96(6), 062125. (doi:10.1103/PhysRevA.96.062125)
Weir, G., Barnett, S. M. and Croke, S. (2017) Optimal discrimination of single-qubit mixed states. Physical Review A: Atomic, Molecular and Optical Physics, 96(2), 022312. (doi:10.1103/PhysRevA.96.022312)
Ritboon, A., Croke, S. and Barnett, S. (2017) Proposed optical realisation of a two photon, four-qubit entangled χ state. Journal of Optics, 19(7), 075201. (doi:10.1088/2040-8986/aa72af)
Croke, S., Barnett, S. M. and Weir, G. (2017) Optimal sequential measurements for bipartite state discrimination. Physical Review A: Atomic, Molecular and Optical Physics, 95(5), 052308. (doi:10.1103/PhysRevA.95.052308)
Trautmann, N., Ferenczi, G., Croke, S. and Barnett, S. M. (2017) Holographic quantum imaging: reconstructing spatial properties via two-particle interference. Journal of Optics, 19(5), 054005. (doi:10.1088/2040-8986/aa67b6)
Croke, S. and Barnett, S. M. (2017) Difficulty of distinguishing product states locally. Physical Review A: Atomic, Molecular and Optical Physics, 95(1), 012337. (doi:10.1103/PhysRevA.95.012337)
Croke, S. (2015) PT-symmetric Hamiltonians and their application in quantum information. Physical Review A: Atomic, Molecular and Optical Physics, 91(5), 052113. (doi:10.1103/PhysRevA.91.052113)
Blume-Kohout, R., Croke, S. and Gottesman, D. (2014) Streaming universal distortion-free entanglement concentration. IEEE Transactions on Information Theory, 60(1), pp. 334-350. (doi:10.1109/TIT.2013.2292135)
Blume-Kohout, R., Croke, S. and Zwolak, M. (2013) Quantum data gathering. Scientific Reports, 3(1800), (doi:10.1038/srep01800)
Gottesman, D., Jennewein, T. and Croke, S. (2012) Longer-baseline telescopes using quantum repeaters. Physical Review Letters, 109(7), Art. 070503. (doi:10.1103/PhysRevLett.109.070503)
Croke, S. and Kent, A. (2012) Security details for bit commitment by transmitting measurement outcomes. Physical Review A: Atomic, Molecular and Optical Physics, 86(5), 052309. (doi:10.1103/PhysRevA.86.052309)
Croke, S.M., O'Sullivan, S.P. and Gabuzda, D.C. (2010) The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk 501 at 8.4-1.6 GHz. Monthly Notices of the Royal Astronomical Society, 402(1), pp. 259-270. (doi:10.1111/j.1365-2966.2009.15923.x)
Lu, Y., Coish, N., Kaltenbaek, R., Hamel, D.R., Croke, S. and Resch, K.J. (2010) Minimum-error discrimination of entangled quantum states. Physical Review A: Atomic, Molecular and Optical Physics, 82(4), 042340. (doi:10.1103/PhysRevA.82.042340)
McEndoo, S., Croke, S., Brophy, J. and Busch, T. (2010) Phase evolution in spatial dark states. Physical Review A: Atomic, Molecular and Optical Physics, 81(4), 043640. (doi:10.1103/PhysRevA.81.043640)
Barnett, S.M. and Croke, S. (2009) On the conditions for discrimination between quantum states with minimum error. Journal of Physics A: Mathematical and Theoretical, 42(6), 062001. (doi:10.1088/1751-8113/42/6/062001)
Barnett, S.M. and Croke, S. (2009) Quantum state discrimination. Advances in Optics and Photonics, 1(2), pp. 238-278. (doi:10.1364/AOP.1.000238)
Croke, S.M. and Gabuzda, D.C. (2008) Aligning VLBI images of active galactic nuclei at different frequencies. Monthly Notices of the Royal Astronomical Society, 386(2), pp. 619-626. (doi:10.1111/j.1365-2966.2008.13087.x)
Croke, S., Barnett, S.M. and Stenholm, S. (2008) Linear transformations of quantum states. Annals of Physics, 323(4), pp. 893-906. (doi:10.1016/j.aop.2007.06.001)
Croke, S., Andersson, E. and Barnett, S.M. (2008) No-signaling bound on quantum state discrimination. Physical Review A: Atomic, Molecular and Optical Physics, 77(1), 012113. (doi:10.1103/PhysRevA.77.012113)
Croke, S., Mosley, P.J., Barnett, S.M. and Walmsley, I.A. (2007) Maximum confidence measurements and their optical implementation. European Physical Journal D, 41(3), pp. 589-598. (doi:10.1140/epjd/e2006-00265-1)
Croke, S., Andersson, E., Barnett, S.M. , Gilson, C.R. and Jeffers, J. (2006) Maximum confidence quantum measurements. Physical Review Letters, 96(7), 070401. (doi:10.1103/PhysRevLett.96.070401)
Mosley, P., Croke, S., Walmsley, I. and Barnett, S.M. (2006) Experimental realization of maximum confidence quantum state discrimination for the extraction of quantum information. Physical Review Letters, 97(19), p. 193601. (doi:10.1103/PhysRevLett.97.193601)
Croke, S., Charlot, P., Gabuzda, D. and Sol, H. (2005) Multi-frequency multi-epoch VLBA polarization observations of MRK 501. Baltic Astronomy, 14(3), pp. 367-370.
School of Physics and Astronomy, Kelvin Building,
