The Experts below are selected from a list of 70482 Experts worldwide ranked by ideXlab platform
Adriana E. Lita - One of the best experts on this subject based on the ideXlab platform.
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tuning between Photon Number and quadrature measurements with weak field homodyne detection
Physical Review A, 2020Co-Authors: G S Thekkadath, Adriana E. Lita, D S Phillips, J F F Bulmer, William R Clements, Andreas Eckstein, Jasleen Lugani, Tom Wolterink, Bryn Bell, S.w. NamAbstract:Variable measurement operators enable the optimization of strategies for testing quantum properties and the preparation of a range of quantum states. Here, we experimentally implement a weak-field homodyne detector that can continuously tune between measuring Photon Numbers and field quadratures. We combine a quantum signal with a coherent state on a balanced beam splitter and detect light at both output ports using Photon-Number-resolving transition edge sensors. We observe that the discrete difference statistics converge to the quadrature distribution of the signal as we increase the coherent state amplitude. Moreover, in a proof-of-principle demonstration of state engineering, we show the ability to control the Photon-Number distribution of a state that is heralded using our weak-field homodyne detector.
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a versatile quantum detector based on homodyne detection with Photon Number resolution
Quantum Information and Measurement (QIM) V: Quantum Technologies (2019) paper S4B.3, 2019Co-Authors: G S Thekkadath, Adriana E. Lita, D S Phillips, J F F Bulmer, William R Clements, Andreas Eckstein, Jasleen Lugani, Christopher G Wade, Tom Wolterink, S.w. NamAbstract:We interfere weak coherent states with heralded Fock states on a balanced beam splitter and detect the output with Photon-Number-resolving detectors. Our setup constitutes a versatile detector that can perform both Gaussian and non-Gaussian measurements.
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tomography of Photon Number resolving continuous output detectors
New Journal of Physics, 2015Co-Authors: Peter C Humphreys, Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Benjamin J Metcalf, T Hiemstra, Joshua Nunn, Animesh Datta, Steven W Kolthammer, Ian A WalmsleyAbstract:We report a comprehensive approach to analysing continuous-output Photon detectors. We employ principal component analysis to maximize the information extracted from output signals, followed by a novel noise-tolerant parameterized approach to the tomography of Photon-Number resolving detectors. We further propose a measure for rigorously quantifying a detector's Photon-Number-resolving capability. Our approach applies to all detectors with continuous-output signals. We illustrate our methods by applying them to experimental data obtained from a transition-edge sensor detector.
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tomography of Photon Number resolving continuous output detectors
arXiv: Quantum Physics, 2015Co-Authors: Peter C Humphreys, Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Benjamin J Metcalf, T Hiemstra, Joshua Nunn, Animesh Datta, Steven W Kolthammer, Ian A WalmsleyAbstract:We report a comprehensive approach to analysing continuous-output Photon detectors. We employ principal component analysis to maximise the information extracted, followed by a novel noise-tolerant parameterised approach to the tomography of PNRDs. We further propose a measure for rigorously quantifying a detector's Photon-Number-resolving capability. Our approach applies to all detectors with continuous-output signals. We illustrate our methods by applying them to experimental data obtained from a transition-edge sensor (TES) detector.
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high quantum efficiency Photon Number resolving detector for Photonic on chip information processing
Conference on Lasers and Electro-Optics, 2013Co-Authors: Brice Calkins, Richard P. Mirin, Adriana E. Lita, Peter C Humphreys, Benjamin J Metcalf, Steven W Kolthammer, Paolo L Mennea, Justin B Spring, Antia Lamas Linares, James C GatesAbstract:We demonstrate a high-efficiency, Photon-Number resolving transition edge sensor, integrated on an optical silica waveguide structure. The detector consists of three individual absorber/sensor devices providing a total system detection efficiency of up to 93% for single Photons at a wavelength of 1551.9 nm. This new design enables high fidelity detection of quantum information processes in on-chip platforms.
A. J. Shields - One of the best experts on this subject based on the ideXlab platform.
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testing the Photon Number statistics of a quantum key distribution light source
Optics Express, 2018Co-Authors: J F Dynes, Marco Lucamarini, Z. L. Yuan, K A Patel, A W Sharpe, M B Ward, A. J. ShieldsAbstract:A commonly held tenet is that lasers well above threshold emit Photons in a coherent state, which follow Poissonian statistics when measured in Photon Number. This feature is often exploited to build quantum-based random Number generators or to derive the secure key rate of quantum key distribution systems. Hence the Photon Number distribution of the light source can directly impact the randomness and the security distilled from such devices. Here, we propose a method based on measuring correlation functions to experimentally characterize a light source’s Photon statistics and use it in the estimation of a quantum key distribution system’s key rate. This promises to be a useful tool for the certification of quantum-related technologies.
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efficient and robust quantum random Number generation by Photon Number detection
Applied Physics Letters, 2015Co-Authors: O. Thomas, Z. L. Yuan, M J Applegate, J F Dynes, D A Ritchie, A. J. ShieldsAbstract:We present an efficient and robust quantum random Number generator based upon high-rate room temperature Photon Number detection. We employ an electric field-modulated silicon avalanche photodiode, a type of device particularly suited to high-rate Photon Number detection with excellent Photon Number resolution to detect, without an applied dead-time, up to 4 Photons from the optical pulses emitted by a laser. By both measuring and modeling the response of the detector to the incident Photons, we are able to determine the illumination conditions that achieve an optimal bit rate that we show is robust against variation in the Photon flux. We extract random bits from the detected Photon Numbers with an efficiency of 99% corresponding to 1.97 bits per detected Photon Number yielding a bit rate of 143 Mbit/s, and verify that the extracted bits pass stringent statistical tests for randomness. Our scheme is highly scalable and has the potential of multi-Gbit/s bit rates.
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efficient Photon Number detection with silicon avalanche photodiodes
European Quantum Electronics Conference, 2011Co-Authors: O. Thomas, Z. L. Yuan, J F Dynes, A W Sharpe, A. J. ShieldsAbstract:Photon Number detection (PND) is an essential requirement for quantum information processing based on Photonic qubits, for example in Bell state measurements used in quantum teleportation1 or heralding the successful operation of a quantum logic gate2, in which Number states due to 0,1 or 2 Photons must be distinguished.
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Photon Number resolving detector based on a quantum dot field effect transistor
Applied Physics Letters, 2007Co-Authors: Beata Kardynal, A. J. Shields, S S Hees, C A Nicoll, I Farrer, D A RitchieAbstract:The authors show that the change in current flowing through the channel of a quantum dot field effect transistor is proportional to the Number (N) of Photons absorbed from an incident pulse. Distinct features due to Photon Number state up to N=3 are resolved. With improvement of external quantum efficiency the device may form a useful Photon Number resolving detector.
Ian A Walmsley - One of the best experts on this subject based on the ideXlab platform.
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tomography of Photon Number resolving continuous output detectors
New Journal of Physics, 2015Co-Authors: Peter C Humphreys, Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Benjamin J Metcalf, T Hiemstra, Joshua Nunn, Animesh Datta, Steven W Kolthammer, Ian A WalmsleyAbstract:We report a comprehensive approach to analysing continuous-output Photon detectors. We employ principal component analysis to maximize the information extracted from output signals, followed by a novel noise-tolerant parameterized approach to the tomography of Photon-Number resolving detectors. We further propose a measure for rigorously quantifying a detector's Photon-Number-resolving capability. Our approach applies to all detectors with continuous-output signals. We illustrate our methods by applying them to experimental data obtained from a transition-edge sensor detector.
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tomography of Photon Number resolving continuous output detectors
arXiv: Quantum Physics, 2015Co-Authors: Peter C Humphreys, Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Benjamin J Metcalf, T Hiemstra, Joshua Nunn, Animesh Datta, Steven W Kolthammer, Ian A WalmsleyAbstract:We report a comprehensive approach to analysing continuous-output Photon detectors. We employ principal component analysis to maximise the information extracted, followed by a novel noise-tolerant parameterised approach to the tomography of PNRDs. We further propose a measure for rigorously quantifying a detector's Photon-Number-resolving capability. Our approach applies to all detectors with continuous-output signals. We illustrate our methods by applying them to experimental data obtained from a transition-edge sensor (TES) detector.
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absolute efficiency estimation of Photon Number resolving detectors using twin beams
arXiv: Quantum Physics, 2009Co-Authors: A P Worsley, H B Coldenstrodtronge, J S Lundeen, Peter J Mosley, Brian J Smith, Graciana Puentes, Nicholas Thomaspeter, Ian A WalmsleyAbstract:A nonclassical light source is used to demonstrate experimentally the absolute efficiency calibration of a Photon-Number-resolving detector. The Photon-pair detector calibration method developed by Klyshko for single-Photon detectors is generalized to take advantage of the higher dynamic range and additional information provided by Photon-Number-resolving detectors. This enables the use of brighter twin-beam sources including amplified pulse pumped sources, which increases the relevant signal and provides measurement redundancy, making the calibration more robust.
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Photon Number statistics of multimode parametric down conversion
Physical Review Letters, 2008Co-Authors: Malte Avenhaus, Hendrik B Coldenstrodtronge, K Laiho, Wolfgang Mauerer, Ian A Walmsley, Christine SilberhornAbstract:: We experimentally analyze the complete Photon Number statistics of parametric down-conversion and ascertain the influence of multimode effects. Our results clearly reveal a difference between single-mode theoretical description and the measured distributions. Further investigations assure the applicability of loss-tolerant Photon Number reconstruction and prove strict Photon Number correlation between signal and idler modes.
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Photon Number resolving detection using time multiplexing
International Quantum Electronics Conference, 2004Co-Authors: Daryl Achilles, Christine Silberhorn, Cezary Sliwa, Konrad Banaszek, Alfred B Uren, Ian A WalmsleyAbstract:A time-multiplexed detector capable of Photon Number resolution was constructed. The detector is analyzed theoretically and used to verify the Photon statistics of weak coherent light. Conditional state preparation using the detector is explored
Sae Woo Nam - One of the best experts on this subject based on the ideXlab platform.
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tomography of Photon Number resolving continuous output detectors
New Journal of Physics, 2015Co-Authors: Peter C Humphreys, Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Benjamin J Metcalf, T Hiemstra, Joshua Nunn, Animesh Datta, Steven W Kolthammer, Ian A WalmsleyAbstract:We report a comprehensive approach to analysing continuous-output Photon detectors. We employ principal component analysis to maximize the information extracted from output signals, followed by a novel noise-tolerant parameterized approach to the tomography of Photon-Number resolving detectors. We further propose a measure for rigorously quantifying a detector's Photon-Number-resolving capability. Our approach applies to all detectors with continuous-output signals. We illustrate our methods by applying them to experimental data obtained from a transition-edge sensor detector.
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tomography of Photon Number resolving continuous output detectors
arXiv: Quantum Physics, 2015Co-Authors: Peter C Humphreys, Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Benjamin J Metcalf, T Hiemstra, Joshua Nunn, Animesh Datta, Steven W Kolthammer, Ian A WalmsleyAbstract:We report a comprehensive approach to analysing continuous-output Photon detectors. We employ principal component analysis to maximise the information extracted, followed by a novel noise-tolerant parameterised approach to the tomography of PNRDs. We further propose a measure for rigorously quantifying a detector's Photon-Number-resolving capability. Our approach applies to all detectors with continuous-output signals. We illustrate our methods by applying them to experimental data obtained from a transition-edge sensor (TES) detector.
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noise free high efficiency Photon Number resolving detectors
Physical Review A, 2005Co-Authors: Danna Rosenberg, Adriana E. Lita, Aaron J Miller, Sae Woo NamAbstract:High-efficiency optical detectors that can determine the Number of Photons in a pulse of monochromatic light have applications in a variety of physics studies, including post-selection-based entanglement protocols for linear optics quantum computing and experiments that simultaneously close the detection and communication loopholes of Bell's inequalities. Here we report on our demonstration of fiber-coupled, noise-free, Photon-Number-resolving transition-edge sensors with 88% efficiency at 1550 nm. The efficiency of these sensors could be made even higher at any wavelength in the visible and near-infrared spectrum without resulting in a higher dark-count rate or degraded Photon-Number resolution.
Gerd Leuchs - One of the best experts on this subject based on the ideXlab platform.
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multiPhoton effects enhanced due to ultrafast Photon Number fluctuations
Physical Review Letters, 2017Co-Authors: T. V. Murzina, Kirill Yu Spasibko, Denis A Kopylov, V L Krutyanskiy, Gerd Leuchs, M V ChekhovaAbstract:The rate of an $n$-Photon effect generally scales as the $n$th order autocorrelation function of the incident light, which is high for light with strong Photon-Number fluctuations. Therefore, ``noisy'' light sources are much more efficient for multiPhoton effects than coherent sources with the same mean power, pulse duration, and repetition rate. Here we generate optical harmonics of the order of 2--4 from a bright squeezed vacuum, a state of light consisting of only quantum noise with no coherent component. We observe up to 2 orders of magnitude enhancement in the generation of optical harmonics due to ultrafast Photon-Number fluctuations. This feature is especially important for the nonlinear optics of fragile structures, where the use of a noisy pump can considerably increase the effect without overcoming the damage threshold.
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extremal states for Photon Number and quadratures as gauges for nonclassicality
Physical Review A, 2015Co-Authors: Z Hradil, Gerd Leuchs, J řehacek, P De La Hoz, L L SanchezsotoAbstract:Rotated quadratures carry the phase-dependent information of the electromagnetic field, so they are somehow conjugate to the Photon Number. We analyze this noncanonical pair, finding an exact uncertainty relation, as well as a couple of weaker inequalities obtained by relaxing some restrictions of the problem. We also find the intelligent states saturating that relation and complete their characterization by considering extra constraints on the second-order moments of the variables involved. Using these moments, we construct performance measures tailored to diagnose Photon-added and Schr\"odinger-cat-like states, among others.
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discrimination of binary coherent states using a homodyne detector and a Photon Number resolving detector
Physical Review A, 2010Co-Authors: Gerd Leuchs, Christoffer Wittmann, Ulrik L Andersen, Masahiro Takeoka, Denis SychAbstract:We investigate quantum measurement strategies capable of discriminating two coherent states probabilistically with significantly smaller error probabilities than can be obtained using nonprobabilistic state discrimination. We apply a postselection strategy to the measurement data of a homodyne detector as well as a Photon Number resolving detector in order to lower the error probability. We compare the two different receivers with an optimal intermediate measurement scheme where the error rate is minimized for a fixed rate of inconclusive results. The Photon Number resolving (PNR) receiver is experimentally demonstrated and compared to an experimental realization of a homodyne receiver with postselection. In the comparison, it becomes clear that the performance of the PNR receiver surpasses the performance of the homodyne receiver, which we prove to be optimal within any Gaussian operations and conditional dynamics.
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demonstration of coherent state discrimination using a displacement controlled Photon Number resolving detector
Physical Review Letters, 2010Co-Authors: Gerd Leuchs, Christoffer Wittmann, Ulrik L Andersen, Masahiro Takeoka, Denis SychAbstract:We experimentally demonstrate a new measurement scheme for the discrimination of two coherent states. The measurement scheme is based on a displacement operation followed by a Photon-Number-resolving detector, and we show that it outperforms the standard homodyne detector which we, in addition, prove to be optimal within all Gaussian operations including conditional dynamics. We also show that the non-Gaussian detector is superior to the homodyne detector in a continuous variable quantum key distribution scheme.
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discrimination of optical coherent states using a Photon Number resolving detector
arXiv: Quantum Physics, 2009Co-Authors: Christoffer Wittmann, Ulrik L Andersen, Gerd LeuchsAbstract:The discrimination of non-orthogonal quantum states with reduced or without errors is a fundamental task in quantum measurement theory. In this work, we investigate a quantum measurement strategy capable of discriminating two coherent states probabilistically with significantly smaller error probabilities than can be obtained using non-probabilistic state discrimination. We find that appropriate postselection of the measurement data of a Photon Number resolving detector can be used to discriminate two coherent states with small error probability. We compare our new receiver to an optimal intermediate measurement between minimum error discrimination and unambiguous state discrimination.