QUANTUM OPTICS & QUANTUM INFORMATION PROCESSING LABORATORY | IISc



PUBLICATIONS



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Patents

  1. Quantum illumination and estimation of object reflectivty using polarization-entangled photon pairs
    Kanad Sengupta, K. Muhammed Shafi, Soumya Asokan, C. M. Chandrashekar
    Indian Patent Application No 202441011695 Filed on 20 February 2024
  2. Quantum lidar using polarization-path entangled single photons
    K. Muhammed Shafi, C. M. Chandrashekar
    Indian Patent App. Number : 202341085278, filed on 13 December 2023
  3. System for generating high-rate quantum random numbers from path-entangled single photons
    K. Muhammed Shafi, Prateek Chawla, Abhaya S. Hegde, R. S. Gayatri, A. Padhye, C. M. Chandrashekar
    Patent No. 502089, filed on July 12, 2022 and Granted on Janaury 23, 2024

In refreed journals

  1. Quantum magnetometry using discrete-time quantum walk
    Kunal Shukla, C. M. Chandrashekar
    Phys. Rev. A 109, 032608 (2024) pdf
  2. Open system approach to Neutrino oscillations in a quantum walk framework
    Himanshu Sahu, C. M. Chandrashekar
    Quantum Information Processing 23 (1), 7 (2024) pdf
  3. Multi-bit quantum random number generator from path-entangled single photons
    K. Muhammed Shafi, Prateek Chawla, Abhaya S. Hegde, R. S. Gayatri, A. Padhye, C. M. Chandrashekar
    EPJ Quantum Technol. 10, 43 (2023)pdf
    Topical issue on Quantum Random Number Generators
  4. Quantum walk-based protocol for secure communication between any two directly connected nodes on a network
    Prateek Chawla, Adithi Ajith, C. M. Chandrashekar
    Physica Scripta 98 (10), 105113 (2023) pdf
  5. Quantum illumination using polarization-path entangled single photons for low reflectivity object detection in noisy background
    K. Muhammed Shafi, A. Padhye, C. M. Chandrashekar
    Optics Express 31 (20), 32093 - 32104 (2023) pdf
  6. Multi-qubit quantum computing using discrete-time quantum walks on closed graphs
    Prateek Chawla, Shivani Singh, Aman Agarwal, Sarvesh Srinivasan, C. M. Chandrashekar
    Scientific Report 13, 12078 (2023) pdf
  7. Harnessing Brillouin Interaction in Rare-earth Aluminosilicate Glass Microwires for Optoelectromechanic Quantum Transduction
    Mrittunjoy Guha Majumdar, C. M. Chandrashekar
    Phys. Lett. A 475, 128829 (2023) pdf
  8. Quantum direct communication protocol using recurrence in k-cycle quantum walk
    Sanjeet Swaroop Panda, P. A. Ameen Yasir, C. M. Chandrashekar
    Phys. Rev . A 107, 022611 (2023) pdf
  9. Optical realization of one-dimensional generalized split-step quantum walks
    P. A. Ameen Yasir, Abhaya S. Hegde, C. M. Chandrashekar
    Optics Continuum 2(1), 90 - 99 (2023)pdf
  10. Non-Markovianity between site pairs in FMO complex using discrete-time quantum jump model
    M. Kundu, C. M. Chandrashekar
    ACS Omega 7, 48067 - 48074 (2022) pdf
  11. Noise resilience in path-polarization hyperentangled probe states
    Akshay Kannan Sairam, C. M. Chandrashekar
    J. Phys. B: At. Mol. Opt. Phys. 55, 225501 (2022) pdf
  12. Characterization of anomalous diffusion in one-dimensional quantum walks
    Abhaya S. Hegde, C. M. Chandrashekar
    J. Phys. A: Math. Theor. 55, 234006 (2022) pdf
  13. Polarization-path-frequency entanglement using interferometry and frequency shifters
    Mrittunjoy Guha Majumdar, C. M. Chandrashekar
    J. Phys. B: At. Mol. Opt. Phys. 55, 045501 (2022)pdf
  14. Generation of hyperentangled states and two-dimensional quantum walks using J or q plates and polarization beamsplitters
    P. A. Ameen Yasir, C. M. Chandrashekar
    Phys. Rev. A 105, 012417 (2022)pdf
  15. Quantum circuits for the realization of equivalent forms of one-dimensional discrete-time quantum walks on near-term quantum hardware
    Shivani Singh, Cinthia H. Alderete, Radhakrishnan Balu, Christopher Monroe, Norbert M. Linke, C. M. Chandrashekar
    Phys. Rev. A 104, 062401 (2021)pdf
  16. Quantum walks in polycyclic aromatic hydrocarbons
    Prateek Chawla, C. M. Chandrashekar
    New J. Phys. 23, 113013 (2021) pdf
  17. Universal quantum computing using single-particle discrete-time quantum walk
    Shivani Singh, Prateek Chawla, Anupam Sarkar, C. M. Chandrashekar
    Scientific Reports 11, 11551 (2021)pdf
  18. Hyperentanglement-enhanced quantum illumination
    Ashwith Varadaraj Prabhu, Baladitya Suri, C. M. Chandrashekar
    Phys. Rev. A, 103, 052608 (2021)pdf
  19. Gravitationally induced entanglement dynamics between two quantum walkers
    Himanshu Badhani, C. M. Chandrashekar
    Eur. Phys. J. C (Particles and Fields), 81: 454 (2021)pdf
  20. Digital quantum simulation framework for energy transport in an open quantum systems
    Pragati Gupta, C. M. Chandrashekar
    New J. Phys. 22, 123027 (2020)pdf
  21. Non-Markovian channel from the reduced dynamics of coin in quantum walk
    Javid Naikoo, Subhashish Banerjee, C. M. Chandrashekar
    Physical Review A 102, 062209 (2020) pdf
  22. Quantum direct communication protocols using discrete-time quantum walk
    S. Srikara, C. M. Chandrashekar
    Quantum Information Processing, 19, 295 (2020) pdf
  23. Quantum walks and Dirac cellular automata on a programmable trapped-ion quantum computer
    C. Huerta Alderete, Shivani Singh, Nhung H. Nguyen, Daiwei Zhu, Radhakrishnan Balu, Christopher Monroe, C. M. Chandrashekar, Norbert M. Linke
    Nature Commununications 11, 3720 (2020)pdf
  24. Discrete-time quantum walk algorithm for ranking nodes on a network
    Prateek Chawla, Roopesh Mangal, C. M. Chandrashekar
    Quantum Information Processing 19, 158 (2020) pdf
  25. Quantum percolation in quasicrystals using continuous-time quantum walk
    Prateek Chawla, C. V. Ambarish, C. M. Chandrashekar
    J. Phys. Commun. 3, 125004 (2019).pdf
  26. Multi-bit quantum random number generator from a single qubit quantum walk
    Anupam Sarkar, C. M. Chandrashekar
    Scientific Reports 9, 12323 (2019). pdf
  27. Optimal strategies to infer the width of an infinite square well by performing measurements on the particle(s) contained in the well
    Ilaria Pizio, Shivani Singh, C. M. Chandrashekar, Matteo G. A. Paris
    J. Phys. A: Math. Theor. 52, 265302 (2019). pdf
  28. Accelerated quantum walk, two-particle entanglement generation and localization
    Shivani Singh, Radhakrishnan Balu, Raymond Laflamme, C. M. Chandrashekar
    Journal of Physics Communications 3 (5), 055008 (2019).pdf
  29. Quantum walker as a probe for its coin parameter
    Shivani Singh, C. M. Chandrashekar, Matteo G. A. Paris
    Phys. Rev. A 99, 052117 (2019). pdf
  30. Simulating Dirac Hamiltonian in curved space-time by split-step quantum Walk
    Arindam Mallick, Sanjoy Mandal, Anirban Karan, C. M. Chandrashekar
    Journal of Physics Communications 3 (1), 015012 (2019). pdf
  31. Enhanced non-Markovian behavior in quantum walks with Markovian disorder
    N. Pradeep Kumar, Subhashish Banerjee, C. M. Chandrashekar
    Scientific Reports 8, 8801 (2018). pdf
  32. Bounds on the dynamics of periodic quantum walks and emergence of gapless and gapped Dirac equation
    N. Pradeep Kumar, Radhakrishna Balu, Raymond Laflamme, C. M. Chandrashekar
    Phys. Rev. A 97, 012116 (2018).pdf
  33. Quantum ratchet in disordered quantum walk
    Sagnik Chakraborty, Arpan Das, Arindam Mallick, C. M. Chandrashekar
    Annalen der Physik, Volume 529, Issue 8, 1600346 (August 2017).pdf
  34. Dynamics and energy spectra of aperiodic discrete-time quantum walks
    N. Lo Gullo, C. V. Ambarish, Th. Busch, L. Dell'Anna, C. M. Chandrashekar
    Phys. Rev. E 96, 012111 (2017).pdf
  35. Neutrino oscillations in discrete-time quantum walk framework
    Arindam Mallick, Sanjoy Mandal, C. M. Chandrashekar
    Eur. Phys. J. C (Particles and Fields), 77: 85 (2017).pdf
  36. Dirac Quantum Cellular Automaton from Split-step Quantum Walk
    Arindam Mallick, C. M. Chandrashekar
    Scientific Reports 6, 25779 (2016). pdf
  37. Localization and limit laws of a three-state alternate quantum walk on a two-dimensional lattice
    Takuya Machida, C. M. Chandrashekar
    Phys. Rev. A 92, 062307 (2015). pdf
  38. Limit distributions for different forms of four-state quantum walks on a two-dimensional lattice
    T. Machida, C. M. Chandrashekar, N. Konno, Th. Busch
    Quantum Information and Computation, Vol. 15, No. 13 & 14, 1248 -1258 (2015). pdf
  39. Localized quantum walks as secured quantum memory
    C. M. Chandrashekar, Th. Busch
    European Physics Letters 110, 10005 (2015). pdf
  40. Quantum percolation and transition point of a directed discrete-time quantum walk
    C. M. Chandrashekar, Th. Busch
    Scientific Reports 4, 6583 (2014). pdf
  41. Single photons in an imperfect array of beam-splitters: Interplay between percolation, backscattering and transient localization
    C. M. Chandrashekar, S. Melville, Th. Busch
    J. Phys. B: At. Mol. Opt. Phys. 47, 085502 (2014). pdf
  42. Noise-enhanced quantum transport on a closed loop using quantum walks
    C. M. Chandrashekar, Th. Busch
    Quantum Information Processing, Volume 13, Issue 6, Pages 1313-1329 (2014). pdf
  43. Two-component Dirac-like Hamiltonian for generating quantum walk on one-, two- and three-dimensional lattices
    C. M. Chandrashekar
    Scientific Reports 3, 2829 (2013). pdf
  44. Enhancement of Geometric Phase by Frustration of Decoherence: A Parrondo like Effect
    Subhashish Banerjee, C. M. Chandrashekar, Arun K. Pati
    Phys. Rev. A, 87, 042119 (2013). pdf
  45. Decoherence on a two-dimensional quantum walk using four- and two-state particle
    C. M. Chandrashekar, Th. Busch
    J. Phys. A: Math. Theor. 46, 105306 (2013). pdf
  46. Quantum walk on distinguishable non-interacting many-particles and indistinguishable two-particle
    C. M. Chandrashekar, Th. Busch
    Quantum Information Processing, Volume 11, Issue 5, Pages 1287-1299 (2012). pdf
  47. Hamilton's turns as visual tool-kit for designing of single-qubit unitary gates
    B. Neethi Simon, C. M. Chandrashekar, Sudhavathani Simon
    Phys. Rev. A 85, 022323 (2012). pdf
  48. Entanglement generation in spatially separated systems using quantum walk
    C. M. Chandrashekar, Sandeep Goyal, and Subhashish Banerjee
    Journal of Quantum Information Sciences, Vol. 2, No.2, pp. 15-22 (2012). pdf
  49. Quantumness of noisy quantum walks : a comparison between measurement-induced disturbance and quantum discord
    Balaji R. Rao, R. Srikanth, C. M. Chandrashekar and Subhashish Banerjee
    Phys. Rev. A, 83, 064302 (2011). pdf
  50. Parrondo's game using a discrete-time quantum walk
    C. M. Chandrashekar and Subhashish Banerjee
    Phys. Lett. A, 375, 1553 (2011). pdf
  51. Disordered-quantum-walk-induced localization of a Bose-Einstein condensate
    C. M. Chandrashekar
    Phys. Rev. A, 83, 022320 (2011). pdf
  52. Zeno subspace in quantum-walk dynamics
    C. M. Chandrashekar
    Phys. Rev. A, 82, 052108 (2010). pdf
  53. Relationship between quantum walks and relativistic quantum mechanics
    C. M. Chandrashekar, Subhashish Banerjee, and R. Srikanth
    Phys. Rev. A, 81, 062340 (2010). pdf
  54. Quantumness in decoherent quantum walk using measurement-induced disturbance
    R. Srikanth, Subhashish Banerjee, and C. M. Chandrashekar
    Phys. Rev. A, 81, 062123 (2010). pdf
  55. Spatial entanglement using quantum walk on a many-body system
    Sandeep K. Goyal and C. M. Chandrashekar
    J. Phys. A: Math. Theor. 43, 235303 (2010). pdf
  56. Fractional recurrence in discrete-time quantum walk
    C. M. Chandrashekar
    Cent. Eur. J. Phys. 8(6), 979-988 (2010). pdf
  57. Quantum data bus in dipolar coupled nuclear spin qubits
    Jingfu Zhang, Michael Ditty, Daniel Burgarth, Colm A. Ryan, C. M. Chandrashekar, Martin Laforest, Osama Moussa, Jonathan Baugh, and Raymond Laflamme
    Phys. Rev. A, 80, 012316 (2009). pdf
  58. Direct observation of quantum criticality in Ising spin chains
    Jingfu Zhang, Fernando M. Cucchietti, C. M. Chandrashekar, Martin Laforest, Colm A. Ryan, Michael Ditty, Adam Hubbard, John K. Gamble, Raymond Laflamme
    Phys. Rev. A, 79, 012305 (2009). pdf
  59. Symmetry-noise interplay in quantum walk on an n-cycle
    Subhashish Banerjee, R. Srikanth, C. M. Chandrashekar, and Pranaw Rungta
    Phys. Rev. A, 78, 052316 (2008). pdf
  60. Generic quantum walk using a coin-embedded shift operator
    C. M. Chandrashekar
    Phys. Rev. A, 78, 052309 (2008). pdf
  61. Quantum phase transition using quantum walks in an optical lattice
    C. M. Chandrashekar and Raymond Laflamme
    Phys. Rev. A, 78, 022314 (2008). pdf
  62. Optimizing the discrete time quantum walk using a SU(2) coin
    C. M. Chandrashekar, R. Srikanth and Raymond Laflamme
    Phys. Rev. A, 77, 032326 (2008). pdf
  63. Quantum information processing using nuclear and electron magnetic resonance: review and prospects
    J. Baugh, J. Chamilliard, C. M. Chandrashekar, M. Ditty, A. Hubbard, M. Laforest, D. Maslov, C. Negrevergne, M. Silva, S. Simmons, C. A. Ryan, R. Laflamme, J. S. Hodges, C. Ramanathan, and D. G. Cory
    Physics in Canada, Theme Issue - Quantum Computing and Quantum Information, Vol. 63, No. 4, 197-206, Oct.-Dec. 2007. pdf
  64. Symmetries and noise in quantum walk
    C. M. Chandrashekar, R. Srikanth, and S. Banerjee
    Phys. Rev. A, 76, 022316 (2007). pdf
  65. Implementing the one-dimensional quantum (Hadamard) walk using a Bose-Einstein condensate
    C. M. Chandrashekar
    Phys. Rev. A, 74, 032307 (2006). pdf
  66. Dynamic Manipulation of Bose-Einstein Condensates with a Spatial Light Modulator
    V. Boyer, R. M. Godun, G. Smirne, D. Cassettari, C. M. Chandrashekar, A.B. Deb, Z.J. Laczik and C. J. Foot
    Phys. Rev. A, 73, 031402 (R) (2006). pdf
  67. Dynamic optical trap generation using FLC SLMs for the manipulation of cold atoms
    V. Boyer, C. M. Chandrashekar, C.J. Foot and Z.J. Laczik
    J. Mod. Opt., vol. 51, no. 14, 2235-2240 (2004). pdf

    68. Pre-prints

  68. Experimental realization of universal quantum gates and six-qubit state using photonic quantum walk
    Kanad Sengupta, K. Muhammed Shafi, S. P. Dinesh, Soumya Asokan, C. M. Chandrashekar
    arXiv:2403.06665
  69. Experimental demonstration of quantum illumination using polarization-entangled photon pairs and CHSH value as measure
    Kanad Sengupta, K. Muhammed Shafi, Soumya Asokan, C. M. Chandrashekar
    arXiv:2401.10182
  70. Reduced dynamics of a PT-symmetric evolution
    Himanshu Badhani, C. M. Chandrashekar
    arXiv:2309.03042
  71. Second-order correlations and purity of unheralded single photons from spontaneous parametric down-conversion
    A. Padhye, K. Muhammed Shafi, C. M. Chandrashekar
    arXiv:2207.06984
  72. Superposition of causal order in quantum walks: non-Markovianity and causal asymmetry
    Prateek Chawla, U. Shrikant, C. M. Chandrashekar
    arXiv:2205.13217
  73. Bell-inequality in path-entangled single photon and purity test
    K. Muhammed Shafi, R. S. Gayatri, A. Padhye, C. M. Chandrashekar
    arXiv:2112.05039
  74. Non-Hermitian quantum walks and non-Markovianity: the coin-position interaction
    Himanshu Badhani, Subhashish Banerjee, C. M. Chandrashekar
    arXiv:2109.10682
  75. Optimal quantum simulation of open quantum systems
    Pragati Gupta, C. M. Chandrashekar
    arXiv:2012.07540
  76. Estimation of one-dimensional discrete-time quantum walk parameters by using machine learning algorithms
    Parth Rajauria, Prateek Chawla, C. M. Chandrashekar
    arXiv:2007.04572
  77. Interference and correlated coherence in disordered and localized quantum walk
    Shivani Singh, C. M. Chandrashekar
    arXiv:1711.06217.
  78. Entanglement Properties of Localized States in 1D Topological Quantum Walks
    C. M. Chandrashekar, H. Obuse, Th. Busch
    arXiv:1502.00436
  79. Disorder induced localization and enhancement of entanglement in one- and two-dimensional quantum walks
    C. M. Chandrashekar
    arXiv:1212.5984