Professor Pieter Kok
School of Mathematical and Physical Sciences
Deputy Head of Department
Professor of Theoretical Physics
+44 114 222 3538
Full contact details
School of Mathematical and Physical Sciences
E12a
Hicks Building
Hounsfield Road
Sheffield
S3 7RH
 Profile

My research is in theoretical optical quantum information processing. I am interested in physical architectures and applications for optical quantum devices: How can we use quantum light for practical quantum communication, metrology, imaging, and computing.
Departmental administration
 Deputy Head of Department from September 2022
 Head of First Year Physics (2012present)
 Member of Teaching Committee and Research Committee
 Qualifications

 Physics degree, University of Utrecht, the Netherlands (19911997)
 Physics PhD, University of Wales, Bangor (19982001)
Academic career
 NRC Research Fellow, NASA Jet Propulsion Laboratory, Pasadena CA (20012003)
 Research Fellow, HewlettPackard Labs, Bristol (20032005)
 Research Fellow, University of Oxford (20052007)
 Lecturer, University of Sheffield (2007present)
 Research interests

Any practical distributed, longdistance quantum technology—such as the quantum Internet—will most likely involve light as a quantum information carrier. It is therefore important to understand the capabilities and limitations of photons as quantum bits.
Broadly speaking, my research falls into three categories:
 linear optical quantum computing
 hybrid quantum computing with light and matter qubits
 quantum metrology
 Publications

Show: Featured publications All publications
Featured publications
Journal articles
 Quantum limits to incoherent imaging are achieved by linear interferometry. Physical Review Letters, 124(8). View this article in WRRO
 Geometric perspective on quantum parameter estimation. AVS Quantum Science, 2(1). View this article in WRRO
 Optimal imaging of remote bodies using quantum detectors. Physical Review Letters, 123(14). View this article in WRRO
 Generating maximal entanglement between spectrally distinct solidstate emitters. Physical Review Letters, 123(2). View this article in WRRO
 Optimal Quantum Metrology of Distant Black Bodies. Quantum, 1, 2121. View this article in WRRO
All publications
Books
 A First Introduction to Quantum Physics. Springer International Publishing.
 A First Introduction to Quantum Physics. Springer International Publishing.
 Introduction to Optical Quantum Information Processing.. Cambridge University Press.
Journal articles
 Bayesian estimation for Bell state rotations. AVS Quantum Science, 5(2).
 Large baseline optical imaging assisted by single photons and linear quantum optics. Physical Review Letters, 130(16).
 Calculating concentratable entanglement in graph states. Physical Review A, 106(4).
 Optical quantum superresolution imaging and hypothesis testing. Nature Communications, 13(1).
 A quantitative comparison of amplitude versus intensity interferometry for astronomy. New Journal of Physics, 24(4).
 Quantumlimited estimation of range and velocity. PRX Quantum, 2(3).
 Faulttolerant quantum data locking. Physical Review A, 103(5).
 Photonic quantum data locking. Quantum, 5.
 Photonic quantum data locking. Quantum, 5.
 Tight bounds on the simultaneous estimation of incompatible parameters. Physical Review X, 11(1).
 Quantum limits to incoherent imaging are achieved by linear interferometry. Physical Review Letters, 124(8). View this article in WRRO
 Geometric perspective on quantum parameter estimation. AVS Quantum Science, 2(1). View this article in WRRO
 Ancillaassisted schemes are beneficial for Gaussian state phase estimation. Physical Review A, 101(1), 012124101212410. View this article in WRRO
 Optimal imaging of remote bodies using quantum detectors. Physical Review Letters, 123(14). View this article in WRRO
 Generating maximal entanglement between spectrally distinct solidstate emitters. Physical Review Letters, 123(2). View this article in WRRO
 NonReciprocal Transmission and Reflection of a ChirallyCoupled Quantum Dot. Nano Letters, 18(9), 54755481. View this article in WRRO
 Analysis of quantum information processors using quantum metrology. Physical Review A, 97(6). View this article in WRRO
 Electrical control of nonlinear quantum optics in a nanophotonic waveguide. Optica, 5(5), 644650. View this article in WRRO
 Optimal Quantum Metrology of Distant Black Bodies. Quantum, 1, 2121. View this article in WRRO
 Quantum metrology of spatial deformation using arrays of classical and quantum light emitters. Physical Review A, 95(6). View this article in WRRO
 Practical repeaters for ultralongdistance quantum communication. Physical Review A  Atomic, Molecular, and Optical Physics, 95. View this article in WRRO
 Role of entanglement in calibrating optical quantum gyroscopes. Physical Review A, 95(1). View this article in WRRO
 Modal decomposition of a propagating matter wave via electron ptychography. Physical Review A, 94. View this article in WRRO
 Local versus global strategies in multiparameter estimation. Physical Review A, 94. View this article in WRRO
 Effect of component variations on the gate fidelity in linear optical networks. Physical Review A, 94(2). View this article in WRRO
 Photonic quantum information processing. Contemporary Physics, 57(4), 526544. View this article in WRRO
 Chirality of nanophotonic waveguide with embedded quantum emitter for unidirectional spin transfer. Nature Communications, 7(1), 1118311183. View this article in WRRO
 Towards universal quantum computation through relativistic motion. Scientific Reports, 6. View this article in WRRO
 Precision estimation of source dimensions from higherorder intensity correlations. Physical Review A, 92. View this article in WRRO
 A new introductory quantum mechanics curriculum. European Journal of Physics, 35(1).
 Parameter estimation using NOON states over a relativistic quantum channel. Physical Review A  Atomic, Molecular, and Optical Physics, 88(5).
 Clusterstate generation with aging qubits. Physical Review A  Atomic, Molecular, and Optical Physics, 88(1).
 Quantum optical information networks. Optics InfoBase Conference Papers.
 Cluster state generation with ageing qubits. Pacific Rim Conference on Lasers and ElectroOptics, CLEO  Technical Digest.
 Superresolving multiphoton interferences with independent light sources. Physical Review Letters, 109(23).
 Fundamental limits of classical and quantum imaging.. Phys Rev Lett, 109(12), 123601.
 Beating the classical resolution limit via multiphoton interferences of independent light sources. Optics InfoBase Conference Papers.
 Information gap for classical and quantum communication in a Schwarzschild spacetime. Physical Review A  Atomic, Molecular, and Optical Physics, 85(4). View this article in WRRO
 Ultimate limits to quantum metrology and the meaning of the Heisenberg limit. Physical Review A  Atomic, Molecular, and Optical Physics, 85(4).
 Creating large NOON states with imperfect phase control. OPT SPECTROSC+, 111(4), 520522.
 Quantum computers: Definition and implementations. Physical Review A  Atomic, Molecular, and Optical Physics, 83(1).
 General Optimality of the Heisenberg Limit for Quantum Metrology. PHYS REV LETT, 105(18). View this article in WRRO
 Unifying parameter estimation and the DeutschJozsa algorithm for continuous variables. PHYS REV A, 82(4). View this article in WRRO
 Geometric derivation of the quantum speed limit. PHYS REV A, 82(2).
 QUANTUM OPTICS Entangled photons report for duty. NAT PHOTONICS, 4(8), 504505.
 APPLICATIONS OF ATOMIC ENSEMBLES IN DISTRIBUTED QUANTUM COMPUTING. INT J QUANTUM INF, 8(12), 181218. View this article in WRRO
 Five Lectures on Optical Quantum Computing, 187219.
 Highefficiency clusterstate generation with atomic ensembles via the dipoleblockade mechanism. PHYS REV A, 79(2). View this article in WRRO
 Quantum computing using isolated qubits. The European Physical Journal Special Topics, 159(1), 8591.
 Effects of selfphasemodulation on weak nonlinear optical quantum gates. PHYS REV A, 77(1).
 Principles of quantum computation and information volume II. Journal of Physics A: Mathematical and Theoretical, 40(40), 1225612258.
 Qubits in the pink. Nature, 444(7115), 4949.
 Quantum lithography: A noncomputing application of quantum information. Atmospheric Chemistry and Physics, 6(12), 7382.
 RELATIVISTIC QUANTUM INFORMATION PROCESSING WITH BOSONIC AND FERMIONIC INTERFEROMETERS. International Journal of Quantum Information, 04(01), 119130.
 Quantum lithography: A noncomputing application of quantum information.. Inform., Forsch. Entwickl., 21, 7382.
 An introduction to quantum information processing: applications and realizations. Contemporary Physics, 46(6), 407436.
 Preparing multipartite entanglement of photons and matter qubits. Journal of Optics B: Quantum and Semiclassical Optics, 7(7), S166S170.
 Efficient optical quantum information processing. Journal of Optics B: Quantum and Semiclassical Optics, 7(7), S135S140.
 Communicating continuous quantum variables between different lorentz frames.. Quantum Information & Computation, 5, 239246.
 Quantum information and computation webcorner.. Quantum Information & Computation, 5, 272272.
 Quantum information and computation webcorner.. Quantum Information & Computation, 4, 161163.
 Limitations on building singlephotonresolution detection devices. IEEE Journal of Selected Topics in Quantum Electronics, 9(6), 14981501.
 Heralded twophoton entanglement from probabilistic quantum logic operations on multiple parametric downconversion sources. IEEE Journal of Selected Topics in Quantum Electronics, 9(6), 14781482.
 Gravitational decoherence. Physical Review D  Particles, Fields, Gravitation and Cosmology, 68(8), 8500618500613.
 Conditional linearoptical measurement schemes generate effective photon nonlinearities. Physical Review A  Atomic, Molecular, and Optical Physics, 68(4 A).
 Construction of a quantum repeater with linear optics. Physical Review A  Atomic, Molecular, and Optical Physics, 68(2), 223011223015.
 Suitability versus fidelity for rating singlephoton guns. Physical Review A  Atomic, Molecular, and Optical Physics, 67(3).
 Quantum information and computation webcorner.. Quantum Information & Computation, 3, 280280.
 Singlephoton quantumnondemolition detectors constructed with linear optics and projective measurements. Physical Review A  Atomic, Molecular, and Optical Physics, 66(6), 638141638149.
 Creation of largephotonnumber path entanglement conditioned on photodetection. Physical Review A  Atomic, Molecular, and Optical Physics, 65(5 A), 521041521045.
 Linear optics and projective measurements along suffice to create largephotonnumber path entanglement. Physical Review A  Atomic, Molecular, and Optical Physics, 65(3 A).
 Quantum Lithography. Optics and Photonics News, 13(9), 2424.
 Quantum information and computation webcorner.. Quantum Information & Computation, 2, 255256.
 Quantum information and computation webcorner.. Quantum Information & Computation, 2, 179180.
 Quantum information and computation webcorner.. Quantum Information & Computation, 2, 596598.
 Multidimensional Hermite polynomials in quantum optics. Journal of Physics A: Mathematical and General, 34(31), 61856195.
 Quantuminterferometric optical lithography: Towards arbitrary twodimensional patterns. Physical Review A. Atomic, Molecular, and Optical Physics, 63(6).
 Webcorner.. Quantum Information & Computation, 1, 9496.
 Quantum information and computation webcorner.. Quantum Information & Computation, 1, 9192.
 Longdistance quantum communication just around the corner?. Quantum Information & Computation, 1, 8788.
 Entanglement swapping as eventready entanglement preparation. Fortschritte der Physik, 48(57), 553557.
 Postselected versus nonpostselected quantum teleportation using parametric downconversion. Physical Review A  Atomic, Molecular, and Optical Physics, 61(4), 4230414230410.
 Spinaugmented observables for efficient photonic quantum error correction. Physical Review A, 108(4).
 Errortolerant oblivious transfer in the noisystorage model. Physical Review Research, 5(3).
 Generating Maximal Entanglement between Spectrally Distinct SolidState Emitters. Physical Review Letters, 123(2).
 Extended analysis of the Trojanhorse attack in quantum key distribution. Physical Review A, 97(4). View this article in WRRO
 Analytic fewphoton scattering in waveguide QED. Physical Review A, 97(4). View this article in WRRO
 Unitary evolution and the distinguishability of quantum states. Physical Review A, 90(6).
 Erratum: General Optimality of the Heisenberg Limit for Quantum Metrology [Phys. Rev. Lett.105, 180402 (2010)]. Physical Review Letters, 107(5).
 Publisher’s Note: Quantum computers: Definition and implementations [Phys. Rev. A83, 012303 (2011)]. Physical Review A, 83(2).
 Efficient growth of complex graph states via imperfect path erasure. New Journal of Physics, 9(6), 196196.
 Publisher's Note: Linear optical quantum computing with photonic qubits [Rev. Mod. Phys. 79, 135 (2007)]. Reviews of Modern Physics, 79(2), 797797.
 Adaptive strategies for graphstate growth in the presence of monitored errors. Physical Review A, 75(4).
 Linear optical quantum computing with photonic qubits. Reviews of Modern Physics, 79(1), 135174.
 Feedforward and its role in conditional linear optical quantum dynamics. Physical Review A, 73(3).
 Repeatuntilsuccess quantum computing using stationary and flying qubits. Physical Review A, 73(1).
 Comment on “Measuring a Photonic Qubit without Destroying It”. Physical Review Letters, 95(4).
 Efficient highfidelity quantum computation using matter qubits and linear optics. Physical Review A, 71(6).
 Symmetry analyzer for nondestructive Bellstate detection using weak nonlinearities. Physical Review A, 71(6).
 All Linear Optical Quantum Memory Based on Quantum Error Correction. Physical Review Letters, 91(21).
 Construction of a quantum repeater with linear optics. Physical Review A, 68(2).
 Suitability versus fidelity for rating singlephoton guns. Physical Review A, 67(3).
 Conditional linearoptical measurement schemes generate effective photon nonlinearities. Physical Review A, 68(4).
 Singlephoton quantumnondemolition detectors constructed with linear optics and projective measurements. Physical Review A, 66(6).
 Linear optics and projective measurements alone suffice to create largephotonnumber path entanglement. Physical Review A, 65(3).
 Creation of largephotonnumber path entanglement conditioned on photodetection. Physical Review A, 65(5).
 Quantuminterferometric optical lithography: Towards arbitrary twodimensional patterns. Physical Review A, 63(6).
 Detection devices in entanglementbased optical state preparation. Physical Review A, 63(3).
 Limitations on the creation of maximal entanglement. Physical Review A, 62(6).
 Quantum Interferometric Optical Lithography: Exploiting Entanglement to Beat the Diffraction Limit. Physical Review Letters, 85(13), 27332736.
 Postselected versus nonpostselected quantum teleportation using parametric downconversion. Physical Review A, 61(4).
 Statistical analysis of quantumentanglednetwork generation. Physical Review A, 99(4). View this article in WRRO
 Maximal entanglement generation in spectrally distinct solid state qubits.
Conference proceedings papers
 Quantum superresolution imaging and hypothesis testing. Photonics for Quantum 2023, 5 June 2023  9 June 2023.
 Subwavelength quantum imaging (pp 73)
 Optimal imaging of remote bodies using quantum detectors. Optics InfoBase Conference Papers
 The quantum limit to incoherent imaging is achieved by linear interferometry. 24th IMEKO TC4 International Symposium and 22nd International Workshop on ADC and DAC Modelling and Testing (pp 239243)
 Generating Maximal Entanglement between Spectrally Distinct SolidState Emitters. 2019 Conference on Lasers and ElectroOptics Europe & European Quantum Electronics Conference (CLEO/EuropeEQEC), 23 June 2019  27 June 2019.
 Practical repeaters for ultralong distance quantum communication. Proceedings of SPIE, Vol. 10118 View this article in WRRO
 Beating the classical resolution limit via multiphoton interferences of independent light sources. Optics InfoBase Conference Papers
 Quantum interferometric sensors. Noise and Fluctuations in Photonics, Quantum Optics, and Communications
 Optical quantum information processing utilizing weak nonlinearities: a little goes a long way. Quantum Communications and Quantum Imaging III
 Classical and quantum information processing with EIT. Advanced Optical and Quantum Memories and Computing II
 Quantum interferometric sensors. Quantum Sensing and Nanophotonic Devices
 From linear optical quantum computing to Heisenberglimited interferometry. Journal of Optics B: Quantum and Semiclassical Optics, Vol. 6(8) (pp S796S800)
 Quantum lithography, entanglement and Heisenberglimited parameter estimation. Journal of Optics B: Quantum and Semiclassical Optics, Vol. 6(8) (pp S811S815)
 Towards photostatistics from photonnumber discriminating detectors. Journal of Modern Optics, Vol. 51(910) (pp 15171528)
 Quantum lithography. Fluctuations and Noise in Photonics and Quantum Optics
 Linear optics with projective measurements for fun and profit. Noise and Information in Nanoelectronics, Sensors, and Standards
 Suitability vs. Fidelity: toward better measures of goodness for singlephoton guns. Optics InfoBase Conference Papers
 Limitations on Building Singlephotonresolution Detection Devices. Optics InfoBase Conference Papers
 NumberResolving Photon and NonPhoton Detectors. Optics InfoBase Conference Papers
 Linear Optical Quantum Memory. Optics InfoBase Conference Papers
 A quantum Rosetta stone for interferometry. Journal of Modern Optics, Vol. 49(1415) (pp 23252338)
Preprints
 Spinaugmented observables for efficient photonic quantum error correction, arXiv.
 Cumulative generation of maximal entanglement between spectrally distinct qubits using squeezed light, arXiv.
 Tight bounds on the simultaneous estimation of incompatible parameters, arXiv.
 NonReciprocal Transmission and Reflection of a ChirallyCoupled Quantum Dot, arXiv.
 Electrical control of nonlinear quantum optics in a nanophotonic waveguide, arXiv.
 Modal decomposition of a propagating matter wave via electron ptychography, arXiv.
 Chirality of nanophotonic waveguide with embedded quantum emitter for unidirectional spin transfer, arXiv.
 Fundamental Limits of Classical and Quantum Imaging.
 Ultimate limits to quantum metrology and the meaning of the Heisenberg limit.
 Information gap for classical and quantum communication in a Schwarzschild spacetime, arXiv.
 Unifying parameter estimation and the DeutschJozsa algorithm for continuous variables.
 General optimality of the Heisenberg limit for quantum metrology.
 Optimality of the Heisenberg limit for continuousvariable quantum metrology.
 What is a quantum computer, and how do we build one?.
 Grants

 Large Baseline QuantumEnhanced Imaging Networks, EPSRC £441k (20212024, PI)
 Quantum and Many Body Physics Enabled by Advanced Semiconductor Nanotechnology, EPSRC £7.7M (20212026, CoI)
 Quantum communications Hub, EPSRC £400k (20192024, PI)
 Semiconductor Quantum Photonics, EPSRC £5.6M (20162021, CoI)
 Quantum Communication, EPSRC QT Hub, £500K (20152019, PI)
 Semiconductor Integrated Quantum Optical Circuits , EPSRC £5M (200122017, CoI)
 Teaching activities

Undergraduate taught modules (current)
 PHY381 Advanced Electrodynamics
 PHY472 Advanced Quantum Mechanics
Undergraduate projects
 PHY391 Quantum Information Labs (with Luke Wilson)
 PHY340/341 Physics Project
 PHY480 Research project
 Professional activities and memberships

 Deputy Head of Department (Sep 2022present)
 Associate Editor for the AIP journal AVS Quantum Science, (2019–present)
 Chair EPSRC Prioritisation Panel for Quantum Technologies (January 2022)
 Member of the Editorial Board of Physical Review A
 External examiner for Physics at Loughborough University (2014present)
Public engagement