Institute for Optical science

Toronto, Canada

Institute for Optical science

Toronto, Canada

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Turner D.B.,Institute for Optical science | Dinshaw R.,Institute for Optical science | Lee K.-K.,Institute for Optical science | Belsley M.S.,University of Minho | And 3 more authors.
Physical Chemistry Chemical Physics | Year: 2012

Recent measurements using two-dimensional electronic spectroscopy (2D ES) have shown that the initial dynamic response of photosynthetic proteins can involve quantum coherence. We show how electronic coherence can be differentiated from vibrational coherence in 2D ES. On that basis we conclude that both electronic and vibrational coherences are observed in the phycobiliprotein light-harvesting complex PC645 from Chroomonas sp. CCMP270 at ambient temperature. These light-harvesting antenna proteins of the cryptophyte algae are suspended in the lumen, where the pH drops significantly under sustained illumination by sunlight. Here we measured 2D ES of PC645 at increasing levels of acidity to determine if the change in pH affects the quantum coherence; quantitative analysis reveals that the dynamics are insensitive to the pH change. © 2012 the Owner Societies.


Mahler D.H.,Institute for Optical science | Mahler D.H.,University of Toronto | Rozema L.A.,Institute for Optical science | Rozema L.A.,University of Toronto | And 8 more authors.
Conference on Lasers and Electro-Optics Europe - Technical Digest | Year: 2014

We measure, using weak measurement, the Bohmian trajectories of one photon that is part of an entangled pair. Our results shed light on the nonlocality of the Bohm model, as well as its so-called "surrealism.". © 2014 Optical Society of America.


Mahler D.H.,Institute for Optical science | Mahler D.H.,University of Toronto | Rozema L.A.,Institute for Optical science | Rozema L.A.,University of Toronto | And 11 more authors.
Optics InfoBase Conference Papers | Year: 2012

We experimentally demonstrate two new quantum tomography protocols, one of which provides a quadratic speedup using adaptation and the other of which enables tomography to be done even with uncalibrated measurement devices. ©2011 Optical Society of America.


Mahler D.H.,Institute for Optical science | Mahler D.H.,University of Toronto | Bateman J.D.,Institute for Optical science | Bateman J.D.,University of Toronto | And 12 more authors.
Optics InfoBase Conference Papers | Year: 2013

We demonstrate optical super-resolution using a quantum centroid measurement of 2-photon N00N states, using a scalable 11-detector measurement scheme. We will also present the latest results from a 3-photon extension. © OSA 2013.


Rozema L.A.,Institute for Optical science | Rozema L.A.,University of Toronto | Bateman J.D.,Institute for Optical science | Bateman J.D.,University of Toronto | And 13 more authors.
Conference on Lasers and Electro-Optics Europe - Technical Digest | Year: 2014

We demonstrate spatial super-resolution, performing an optical centroid measurement on 4-photon N00N states with a scalable 11-detector measurement. Our results show spatial superresolution with exponentially better detection efficiency than any previous N00N-state experiment. © 2014 Optical Society of America.


Rozema L.A.,University of Toronto | Rozema L.A.,Institute for Optical science | Darabi A.,University of Toronto | Darabi A.,Institute for Optical science | And 6 more authors.
2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011 | Year: 2011

Quantum process tomography requires a set of input states sensitive to the unknown process. We experimentally generate a class of 4-photon states and compare their sensitivity to that of coherent states to a decohering process. © 2011 OSA.


Mahler D.H.,Institute for Optical science | Mahler D.H.,University of Toronto | Rozema L.A.,Institute for Optical science | Rozema L.A.,University of Toronto | And 2 more authors.
2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011 | Year: 2011

Quantum process tomography (QPT) is a resource intensive task. We present an experiment in which a 3 dimensional decoherence free subspace is experimentally identified using 36 measurements, instead of the 256 measurements required for QPT. © 2011 OSA.


Sullan R.M.A.,University of Toronto | Sullan R.M.A.,Catholic University of Louvain | Shi W.,University of Toronto | Chan H.,University of Toronto | And 4 more authors.
Soft Matter | Year: 2013

Polymeric additives affect the mechanics of phospholipid vesicles, but little is known about the effect to supported lipid bilayers that are phase segregated on the submicron length scale. In this study, we use AFM-based force mapping, by means of breakthrough forces, to quantify the spreading pressures and line tensions of raft-forming lipid bilayers consisting of dioleoylphosphatidylcholine (DOPC), egg sphingomyelin (ESM), and cholesterol (Chol) in the presence of diblock copolymers comprised of polystyrene (PS) and poly(ethylene oxide) (PEO), PS-b-PEO. Varying molecular weights of PS-b-PEO were used in the experiments. The presence of the polymer leads to higher breakthrough forces when compared to pure DOPC/ESM/Chol bilayers. The lipid-polymer composite made with a PS block radius of gyration comparable to the bilayer thickness and a PEO block length that is the shortest exhibits the highest breakthrough forces and hence is the most stable mechanically. The breakthrough force distributions are analyzed to extract the spreading pressures and line tensions of the lipid-polymer composites. The spreading pressure is seen to increase with the addition of PS-b-PEO, and on average, increases with decreasing PEO block length. Based on the results, we propose the incorporation of the PS moiety into the bilayer core as the main mechanism of this enhanced resistance to bilayer breakthrough by the AFM tip. © 2013 The Royal Society of Chemistry.


Harikumar K.R.,Institute for Optical science | McNab I.R.,Institute for Optical science | Polanyi J.C.,Institute for Optical science | Zabet-Khosousi A.,Institute for Optical science | And 2 more authors.
Chemical Communications | Year: 2011

Chloropentane forms asymmetric ('A') and symmetric ('S') pairs on Si(100)-2×1, differing in the direction of curvature of one pentane tail. Surprisingly this renders the rate of thermal reaction of 'A' fifteen times greater than 'S' in chlorinating room-temperature silicon. Correspondingly, for electron-induced reaction the energy threshold for A is 1 eV less than for S. © The Royal Society of Chemistry 2011.

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