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Quantum Imaging - UMBC

Objective: ?Study the physics of multi-photon imaging, distinguish their quantum and classical nature, in parti-cular, the necessary and/or unnecessary role of quantum entanglement in quantum imaging.". Part I: The Physics of Quantum Imaging. Quantum imaging has demonstrated two peculiar features: .

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Quantum Imaging - UMBC

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    10. Point-point correlation between object-image planes. Point-point correlation between object-image planes.

    11. Quantum entanglement started from 1935 … The only paper in the history of Phys. Rev. with “no reference” … Prof. Greenberger: after 70 years this paper is the No. 1 downloaded paper from the Phys. Rev. archives. (1) & (2) points … Quantum entanglement started from 1935 … The only paper in the history of Phys. Rev. with “no reference” … Prof. Greenberger: after 70 years this paper is the No. 1 downloaded paper from the Phys. Rev. archives. (1) & (2) points …

    41. Range Finder, Stand Off Detection, and 3-D Lidar (APD Arrays) Applications

    42. High Performance Photon Counting Detectors and Arrays

    43. Mesa vs. Guard-Ring Potential issues with mesa APDS for space applications: Short lifetime from early breakdown (reliability) Dark current increases over time (stability)

    44. Reliability of Guard-Ring APDS

    45. Key Issues for Photon Counting (PC)

    46. Geiger Mode Operations-I

    47. Geiger Mode Operations-II

    48. Geiger Mode Operations-III

    49. Optimize Design To Achieve High Differential Gain and Low Dark Current

    50. Dark Current I-V Characteristics Changing with Temperature * The dark current is reduced The gain is increased A sharp rising gain with the bias voltage will help to choose good operating points.

    51. 16x16 Arrays and Vbr Color Map

    52. 64x64 Arrays and Vbr

    53. Breakdown Voltage Distribution

    54. Innovative Current Bias Scheme No need to know the breakdown voltage Less sensitive to the temperature fluctuation Much easier to control the bias point. Ideal for APD arrays operations Partially solved the after-pulsing problem.

    55. Photon Counting Testing Setup

    56. Operating temperature Dependence II

    57. Dark Count Probability Versus Vac at Different Temperatures

    58. Dark Count Probability Versus the Combination of IDC and Vac at Fixed Temperatures

    59. Detection Efficiency ~25% Achieved Under Gated Mode Operations

    60. After Pulsing Problems

    61. Suppression of After-Pulsing

    62. Increasing The DC Source Current Can Reduce The Charging Time.

    63. More on Bias Current Effects

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