Dynamical observations of self-stabilizing stationary light
J. L. Everett,    G. T. Campbell,    Y.-W. Cho,    P. Vernaz-Gris,    D.B. Higginbottom,    O. Pinel,    N. P. Robins,    P. K. Lam    & B. C. Buchler
Nat. Phys. 10.1038/nphys3901 (2017)  

Tuning quantum measurements to control chaos
Eastman J, Hope J, Ribeiro de Carvalho A
Scientific Reports 7, 1-10 (2017)

Characterization of a measurement-based noiseless linear amplifier and its applications
Zhao J, Haw J, Symul T, Lam P, Assad S
Physical Review A - Atomic, Molecular, and Optical Physics 96 (2017)

Phase estimation of coherent states with a noiseless linear amplifier
Assad S, Bradshaw M, Lam P
International Journal of Quantum Information 15, 1-6 (2017)

Overarching framework between Gaussian quantum discord and Gaussian quantum illumination
Bradshaw M, Assad S, Haw J, Tan S, Lam P, Gu M
Physical Review A: Atomic, Molecular and Optical Physics 95, 2, 1-10 (2017)



Pure single photons from a trapped atom source
Higginbottom D, Slodicka L, Araneda G, Lachman L, Filip R, Hennrich M, Blatt R
New Journal of Physics 18, 9 (2016)

Surpassing the no-cloning limit with a heralded hybrid linear amplifier for coherent states
Haw J, Zhao J, Dias J, Assad S, Bradshaw M, Blandino R, Symul T, Ralph T, Lam P
Nature Communications 7, 1-7 (2016)

Estimation of output-channel noise for continuous-variable quantum key distribution
Thearle O, Assad S, Symul T
Physical Review A - Atomic, Molecular, and Optical Physics 93, 042343, 6 (2016)

Quantum entanglement of angular momentum states with quantum numbers up to 10,010
Fickler R, Campbell G, Buchler B, Lam P, Zeilinger A
PNAS - Proceedings of the National Academy of Sciences of the United States of America 113, 48, 13642-13647, (2016)

Maximizing device-independent randomness from a Bell experiment by optimizing the measurement settings
SM Assad, O Thearle, PK Lam
Phys. Rev. A 94, 012304

Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution
Nathan Walk, Sara Hosseini, Jiao Geng, Oliver Thearle, Jing Yan Haw, Seiji Armstrong, Syed M Assad, Jiri Janousek, Timothy C Ralph, Thomas Symul, Howard M Wiseman, Ping Koy Lam
Optica 3, 634-642 (2016)

Optomechanical magnetometry with a macroscopic resonator
Changqiu Yu, Jiri Janousek, Eoin Sheridan, David L McAuslan, Halina Rubinsztein-Dunlop, Ping Koy Lam, Yundong Zhang, Warwick P Bowen
Physical Review Applied 5, 044007 (2016)

Squeezing quadrature rotation in the acoustic band via optomechanics
Giovanni Guccione, Harry J Slatyer, André R R Carvalho, Ben C Buchler and Ping Koy Lam
Journal of Physics B: Atomic, Molecular and Optical Physics 49, 065401 (2016)

Synthesis of optical spring potentials in optomechanical systems
HJ Slatyer, G Guccione, YW Cho, BC Buchler, PK Lam
Journal of Physics B: Atomic, Molecular and Optical Physics 49, 125401 (2016)

Squeezed light from a diamond-turned monolithic cavity
A Brieussel, Y Shen, G Campbell, G Guccione, J Janousek, B Hage, BC Buchler, N Treps, Christian Fabre, FZ Fang, XY Li, T Symul, PK Lam
Optics Express 24, 4042-4056 (2016)

Highly efficient optical quantum memory with long coherence time in cold atoms
Y.-W. Cho, G. T. Campbell, J. L. Everett, J. Bernu, D. B. Higginbottom, M. T. Cao, J. Geng, N. P. Robins, P. K. Lam, and B. C. Buchler,
Optica  3, 100 (2016).


A mirrorless spinwave resonator
O. Pinel, J. L. Everett, M. Hosseini, G. T. Campbell, B. C. Buchler and P. K. Lam
Scientific Reports 5, 17633 (2015).

Replicating the Benefits of Deutschian Closed Timelike Curves without Breaking Causality
X. Yuan, S. M. Assad, J. Thompson, J. Y. Haw, V. Vedral, T. C. Ralph, P. K. Lam, C. Weedbrook and M. Gu
npj Quantum Information 1, 15007 (2015)

Dual-rail optical gradient echo memory
D. B. Higginbottom, J. Geng, G. T. Campbell, M. Hosseini, M. T. Cao, B. M. Sparkes, J. Bernu, N. P. Robins, P. K. Lam and B. C. Buchler
Optics Express 23 24937 (2015).

Maximization of Extractable Randomness in a Quantum Random-Number Generator
J. Y. Haw, S. M. Assad, A. M. Lance, N. H. Y. Ng, V. Sharma, P. K. Lam, and T. Symul
Phys. Rev. Applied 3, 054004 (2015)

Nonlinear entanglement and its application to generating cat States.
Y Shen, S M Assad, N B Grosse, X Y Li, M D Reid, and P K Lam.
Phys Rev Lett 114, 100403 (2015).

Multipartite Einstein-Podolsky-Rosen steering and genuine tripartite entanglement with optical networks.
Seiji Armstrong, Meng Wang, Run Yan Teh, Qihuang Gong, Qiongyi He, Jiri Janousele, Hans-Albert Bachor, Margaret D Reid and Ping Koy Lam.
Nature Physics, 11 167 (2015).


Electromagnetically induced transparency and four-wave mixing in a cold atomic ensemble with large optical depth.
J Geng, G T Campbell, J Bernu, D B Higginbottom, B M Sparkes, S M Assad, W P Zhang, N P Robins, P K Lam, and B C Buchler.
New J Phys, 2014 vol. 16 (11) p. 113053.

Asymmetric EPR entanglement in continuous variable systems
K. Wagner, J. Janousek, S. Armstrong, J.-F. Morizur, P. K. Lam and H.-A. Bachor
J. Phys. B: At. Mol. Opt. Phys. 47 225502 (2014)

Theoretical analysis of an ideal noiseless linear amplifier for Einstein-Podolsky-Rosen entanglement distillation
J. Bernu, S. Armstrong, T. Symul, T.C. Ralph and P.K. Lam
J Phys B-At Mol Opt,  47, 215503 (2014)

Multimode laser cooling and ultra-high sensitivity force sensing with nanowires
Mahdi Hosseini, Giovanni Guccione, Harry J. Slatyer, Ben C. Buchler & Ping Koy Lam
Nature Communications 5, 4663 (2014)

Configurable Unitary Transformations and Linear Logic Gates Using Quantum Memories
G. T. Campbell, O. Pinel, M. Hosseini, T. C. Ralph, B. C. Buchler, and P. K. Lam
Phys. Rev. Lett. 113, 063601 (2014).

Impact of backscattered light in a squeezing-enhanced interferometric gravitational-wave detector
S. S. Y. Chua et al.
Classical and Quantum Gravity, 31, 035017 (2014).

Measurement-based noiseless linear amplification for quantum communication
Helen M. Chrzanowski, Nathan Walk, Syed M. Assad, Jiri Janousek, Sara Hosseini, Timothy C. Ralph, Thomas Symul & Ping Koy Lam
Nature Photonics 8 333 (2014).

Experimental verification of quantum discord in continuous-variable states
S. Hosseini, S. Rahimi-Keshari, J. Y. Haw, S. M. Assad, H. M. Chrzanowski, J. Janousek, T. Symul, T. C. Ralph and P. K. Lam
Journal of Physics B, 47, 025503 (2014).


Gradient Echo Quantum Memory in Warm Atomic Vapor
Olivier Pinel, Mahdi Hosseini, Ben M. Sparkes, Jesse L. Everett, Daniel Higginbottom, Geoff T. Campbell, Ping Koy Lam and Ben C. Buchler
JoVE 2013 81, e5055 (2013).

Scattering-Free Optical Levitation of a Cavity Mirror
G. Guccione, M. Hosseini, S. Adlong, M. T. Johnsson, J. Hope, B. C. Buchler, and P. K. Lam
Phys. Rev. Lett. 111, 183001 (2013).

Generation and interferometric analysis of high charge optical vortices
Yong Shen, Geoff T Campbell, Boris Hage, Hongxin Zou, Ben C Buchler and Ping Koy Lam
Journal of Optics 15 044005 (2013)

Experimental investigation of the transition between Autler-Townes splitting and electromagnetically-induced-transparency models
L, Giner, L. Veissier, B. Sparkes, A.S. Sheremet, A. and Nicolas, O.S. Mishina, M. Scherman, S. Burks, I. Shomroni, D.V. Kupriyanov, P.K. Lam, E. Giacobino and J. Laurat.
Phys. Rev. A,  87, 013823 (2013)

Gradient echo memory in an ultra-high optical depth cold atomic ensemble
B M Sparkes, J Bernu, M Hosseini, J Geng, Q Glorieux, P A Altin, P K Lam, N P Robins and B C Buchler
New Journal of Physics 15 085027 (2013)

Security of continuous-variable quantum cryptography with Gaussian postselection
N. Walk, T.C. Ralph, T. Symul, T and P.K. Lam.
Phys. Rev. A, 87, 020303 (2013)


Memory-enhanced noiseless cross-phase modulation
M. Hosseini, S. Rebić, B. M. Sparkes, J. Twamley, B. C. Buchler and P.K. Lam
Nature Light Science and Applications 1 e40 (2012)

Observing the operational significance of discord consumption
M. Gu, H.M. Chrzanowski, S.M. Assad, T. Symul, K. Modi, T.C. Ralph, V. Vedral and P.K. Lam
Nature Physics 8 671 (2012)

Programmable multimode quantum networks
S. Armstrong, J.F. Morizur, J. Janousek, B. Hage, N. Treps, P.K. Lam, H.A. Bachor
Nature Communications 3, 1026 (2012)

Quantum benchmarking with realistic states of light
N. Killoran, M. Hosseini, B. C. Buchler, P. K. Lam, and N. Lütkenhaus
Phys. Rev. A 86, 022331 (2012)

Spatial-mode storage in a gradient-echo memory
D. B. Higginbottom, B. M. Sparkes, M. Rancic, O. Pinel, M. Hosseini, P. K. Lam, and B. C. Buchler
Phys. Rev. A 86, 023801 (2012)

Balanced homodyne detection of optical quantum states at audio-band frequencies and below
M. S. Stefszky, C. M. Mow-Lowry, S. S. Y. Chua, D. A. Shaddock, B. C. Buchler, H. Vahlbruch, A. Khalaidovski, R. Schnabel, P. K. Lam and D. E. McClelland
Classical and Quantum Gravity 29 145015 (2012)

Precision Spectral Manipulation: A Demonstration Using a Coherent Optical Memory
B. M. Sparkes, M. Hosseini, C. Cairns, D. Higginbottom, G. T. Campbell, P. K. Lam, and B. C. Buchler 
Phys. Rev. X 2, 021011 (2012)

Storage and manipulation of light using a Raman gradient-echo process
M Hosseini, B M Sparkes, G T Campbell, P K Lam and B C Buchler
J. Phys. B: At. Mol. Opt. Phys. 45 124004 (2012)

Time- and frequency-domain polariton interference
G Campbell, M Hosseini, B M Sparkes, P K Lam and B C Buchler
New Journal of Physics 14 033022 (2012)

Generation of high-order optical vortices using directly machined spiral phase mirrors
G. Campbell, B. Hage, B. C. Buchler, and P. K. Lam
Applied Optics, Vol. 51, Issue 7, pp. 873-876 (2012)


Backscatter tolerant squeezed light source for advanced gravitational-wave detectors
Sheon S. Y. Chua, Michael S. Stefszky, Conor M. Mow-Lowry, Ben C. Buchler, Sheila Dwyer, Daniel A. Shaddock, Ping Koy Lam, and David E. McClelland
Optics Letters, Vol. 36, Issue 23, pp. 4680-4682 (2011)

Photon-number discrimination without a photon counter and its application to reconstructing non-Gaussian states
H. M. Chrzanowski, J. Bernu, B. M. Sparkes, B. Hage, A. P. Lund, T. C. Ralph, P. K. Lam, and T. Symul
Phys. Rev. A 84, 050302(R) (2011) 

A scalable, self-analyzing digital locking system for use on quantum optics experiments
B. M. Sparkes, H. M. Chrzanowski, D. P. Parrain, B. C. Buchler, P. K. Lam, and T. Symul
Rev. Sci. Instrum. 82, 075113 (2011)

Unconditional room-temperature quantum memory
M. Hosseini, G. Campbell, B. M. Sparkes, P. K. Lam and B. C. Buchler
Nature Physics, 7, 794 (2011)

Real time demonstration of high bitrate quantum random number generation with coherent laser light
T. Symul, S. M. Assad, and P. K. Lam
Appl. Phys. Lett. 98, 231103 (2011)

High efficiency coherent optical memory with warm rubidium vapour
M. Hosseini, B. M. Sparkes, G. Campbell, P. K. Lam and B. C. Buchler
Nature Communications 2,174 (2011)

An investigation of doubly-resonant OPOs and non-linear crystals for squeezing
M. Stefszky, C. Mow-Lowry, K. McKenzie, S. Chua, B.C. Buchler, T. Symul, D. McClelland and P.K. Lam
J. Phys. B: At. Mol. Opt. Phys. 44 015502 (2011)


ac Stark gradient echo memory in cold atoms
B.M. Sparkes, M. Hosseini, G. Hétet, P.K. Lam and B. C. Buchler
Phys. Rev. A 82, 043847 (2010)

Precision spectral manipulation of optical pulses using a coherent photon echo memory
B. C. Buchler, M. Hosseini, G. Hétet, B. M. Sparkes and P. K. Lam
Optics Letters vol. 35 pp 1091-1093 (2010)


Spatial-state Stokes-operator squeezing and entanglement for optical beams.
Phys. Rev. A (2009) vol. 79 (4) 043825
M. T. L Hsu, W. P Bowen, P. K Lam.

Distinguishability of Gaussian states in quantum cryptography using postselection
C. Weedbrook, D. J. Alton, T. Symul, P. K. Lam and T. C. Ralph
Physical Review A, 79, 062311 (2009), 062311 (2009) 

Optical entanglement of co-propagating modes
J. Janousek, K. Wagner, J. F. Morizur, N. Treps, P. K. Lam, C. C. Harb and H.-A Bachor
Nature Photonics, 3, 399 (2009),

A coherent optical pulse sequencer for quantum applications
M. Hosseini, B. M. Sparkes, G. Hétet, J. Longdell, P. K. Lam and B. C. Buchler
Nature vol. 461(7261) pp. 241-245 (2009)

A bright future for quantum communications
T. C. Ralph and P.K. Lam
Nature Photonics 3, 671 (2009), 671 (2009)



Multimodal Properties and Dynamics of Gradient Echo Quantum Memory.
Phys. Rev. Lett. (2008) vol.101, 203601 
G Hétet, J. J Longdell, M. J Sellars, P. K Lam, B. C Buchler.

Photon echoes generated by reversing magnetic field gradients in a rubidium vapor.
Optics Letters (2008) vol. 33 (20) pp. 2323-2325
G Hétet, M Hosseini, B. M Sparkes, D Oblak, P. K Lam, B. C Buchler.

Single-atom detection with optical cavities.
Phys. Rev. A (2008) vol. 78 (1) 013640
R Poldy, B. C Buchler, J. D Close.

Delay of squeezing and entanglement using electromagnetically induced transparency in a vapour cell.
Opt Express (2008) vol. 16 (10) pp. 7369-7381
G Hètet, B. C Buchler, O Glöckl, M. T. L Hsu, A. M Akulshin, H. A Bachor, P. K Lam.

Characterization of electromagnetically-induced-transparency-based continuous-variable quantum memories.
Phys. Rev. A (2008) vol. 77 (1) 012323
G Hetet, A Peng, M. T Johnsson, J. J Hope, P. K Lam.

Electro-optic quantum memory for light using two-level atoms.
Phys. Rev. Lett. (2008) vol. 100 (2) 023601
G Hetet, J. J Longdell, A. L Alexander, P. K Lam, M. J Sellars.

Entangling the spatial properties of laser beams.
K. Wagner, Ji. Janousek, V. Delaubert, H. Zou, C. Harb, Ni. Treps, J. F. Morizur, P. K. Lam, H. A Bachor.
Science (2008) vol. 321 (5888) 541-543

Analytic treatment of controlled reversible inhomogeneous broadening quantum memories for light using two-level atoms.
J. J Longdell, G Hetet, P. K Lam, M. J Sellars.
Phys. Rev. A (2008) vol. 78 (3) 032337

Quantum cloning of continuous-variable entangled states.
C.Weedbrook, N. B Grosse, T. Symul, P.K. Lam, T. C. Ralph.
Phys. Rev. A (2008) vol. 77 (5) 052313

Observation of entanglement between two light beams spanning an octave in optical frequency.
N. B Grosse, S. Assad, M. Mehmet, R. Schnabel, T. Symul, P. K. Lam.
Phys. Rev. Lett. (2008) vol. 100 (24) 243601


Experimental demonstration of post-selection-based continuous-variable quantum key distribution in the presence of Gaussian noise.
Phys. Rev. 76 A (R), 030303 (2007)
Thomas Symul, Daniel J Alton, Syed M Assad, Andrew M Lance, Christian Weedbrook, Timothy C Ralph, Ping Koy Lam.

Technical limitations to homodyne detection at audio frequencies.
Applied Optics, 46:3389–3395, (2007)
K. McKenzie, M. B. Gray, P. K. Lam, and D. E. McClelland.

Measuring photon antibunching from continuous variable sideband squeezing
Phys. Rev. Lett., 98, 153603, Apr 2007.
N. B. Grosse, T. Symul, M. Stobinska, T. C. Ralph, and P. K. Lam

Squeezed light for bandwidth-limited atom optics experiments at the rubidium D1 line. 
Journal of Physics B, 40, 221, (2007).
G. Hétet, O. Glöckl, K. A. Pilypas, C. C. Harb, B. C. Buchler, H.-A. Bachor and P. K. Lam


Quantum study of information delay in electromagnetically induced transparency 
Physical Review Letters, 97, 183601, (2006).
M. T. L. Hsu, G. Hétet, O. Glöckl, J. J. Longdell, B. C. Buchler, H.-A. Bachor, and P. K. Lam.

Nonlinear phase matching locking via optical readout.
Opt Express 14, 11256 (2006)
Kirk McKenzie, Malcolm B Gray, Ping Koy Lam, David E McClelland.

Effect of atomic noise on optical squeezing via polarization self-rotation in a thermal vapour cell
Phys. Rev. A 73, 023806 (2006)
M. T. L. Hsu, G. Hétet, A. Peng, C. C. Harb, H.-A. Bachor, M. T. Johnsson, J. J. Hope, P. K. Lam, A. Dantan, J. Cviklinski, A. Bramati, and M. Pinard

Coherent-state quantum key distribution without random basis switching
Phys. Rev. A 73, 022316 (2006)
C. Weedbrook, A. M. Lance, W. P. Bowen, T. Symul, T. C. Ralph and P. K. Lam

Harmonic Entanglement with second-order nonlinearity
Phys. Rev. Lett. 96, 063601 (2006)
N. B. Grosse, W. P. Bowen, K. McKenzie, and P. K. Lam

Spatial quantum effects with continuous-wave laser beams
J. Mod. Opt. 53, 597 (2006)
H. –A. Bachor, V. Delaubert, C. C. Harb, M. T. L. Hsu, P. K. Lam, C. Fabre and N. Treps

A complete quantum cryptographic system using a continuous wave laser
SPIE 6038, 03-1 (2006)
V. Sharma, A. M. Lance, T. Symul, C. Weedbrook, T. C. Ralph, and P. K. Lam

Squeezed state generation for interferometric gravitational-wave detection
Class. Quantum Grav. 23, S245 (2006)
K. McKenzie, M. B. Gray, S. Goßler, P. K. Lam and D. E. McClelland

Quantum-state engineering with continuous-variable postselection
Phys. Rev. A 73, 041801(R) (2006)
A. M. Lance, H. Jeong, N. B. Grosse, T. Symul, T. C. Ralph, and P. K. Lam

Quantum measurements of spatial conjugate variables: displacement and tilt of a Gaussian beam
Opt. Lett. 31, 1537 (2006)
V. Delaubert, N. Treps, C. C. Harb, P. K. Lam, and H. –A, Bachor

Generation of squeezing in higher order Hermite-Gaussian modes with an optical parametric amplifier
J. Euro. Opt. Soc. 1, 06003 (2006)
M. Lassen, V. Delaubert, C. C. Harb, P. K. Lam, N. Treps, and H. –A. Bachor


Earlier Publications




Pages maintained by
Ben Buchler