The Experts below are selected from a list of 40800 Experts worldwide ranked by ideXlab platform
Lijian Zhang - One of the best experts on this subject based on the ideXlab platform.
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experimental quantification of coherence of a tunable Quantum Detector
Physical Review Letters, 2020Co-Authors: Thomas Theurer, Dario Egloff, Ziwen Liu, Martin B Plenio, Lijian ZhangAbstract:Quantum coherence is a fundamental resource that Quantum technologies exploit to achieve performance beyond that of classical devices. A necessary prerequisite to achieve this advantage is the ability of measurement devices to detect coherence from the measurement statistics. Based on a recently developed resource theory of Quantum operations, here we quantify experimentally the ability of a typical Quantum-optical Detector, the weak-field homodyne Detector, to detect coherence. We derive an improved algorithm for Quantum Detector tomography and apply it to reconstruct the positive-operator-valued measures of the Detector in different configurations. The reconstructed positive-operator-valued measures are then employed to evaluate how well the Detector can detect coherence using two computable measures. As the first experimental investigation of Quantum measurements from a resource theoretical perspective, our work sheds new light on the rigorous evaluation of the performance of a Quantum measurement apparatus.
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Quantum Detector tomography of a time multiplexed superconducting nanowire single photon Detector at telecom wavelengths
Optics Express, 2013Co-Authors: Chandra M Natarajan, Lijian Zhang, H B Coldenstrodtronge, Gaia Donati, Sander N Dorenbos, Val Zwiller, Ian A Walmsley, Robert H HadfieldAbstract:Superconducting nanowire single-photon Detectors (SNSPDs) are widely used in telecom wavelength optical Quantum information science applications. Quantum Detector tomography allows the positive-operator-valued measure (POVM) of a single-photon Detector to be determined. We use an all-fiber telecom wavelength Detector tomography test bed to measure Detector characteristics with respect to photon flux and polarization, and hence determine the POVM. We study the SNSPD both as a binary Detector and in an 8-bin, fiber based, Time-Multiplexed (TM) configuration at repetition rates up to 4 MHz. The corresponding POVMs provide an accurate picture of the photon number resolving capability of the TM-SNSPD.
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recursive Quantum Detector tomography
New Journal of Physics, 2012Co-Authors: Martin B Plenio, Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of Quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states, which begins by reconstructing the diagonals of the operator and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure corresponding to a recently developed
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recursive Quantum Detector tomography
arXiv: Quantum Physics, 2012Co-Authors: Martin B Plenio, Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of Quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states which begins by reconstructing the diagonals of the operator, and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure (POVM) corresponding to a recently developed coherent optical Detector with phase sensitivity and number resolution. We discuss the effect of various parameters on the reconstruction accuracy. The results show the efficiency of the method and its robustness to experimental noise.
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mapping coherence in measurement via full Quantum tomography of a hybrid optical Detector
Nature Photonics, 2012Co-Authors: Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Graciana Puentes, Jeff S Lundeen, Brian J Smith, Martin B PlenioAbstract:Quantum states and measurements exhibit wave-like (continuous) or particle-like (discrete) character. Hybrid discrete–continuous photonic systems are key to investigating fundamental Quantum phenomena1,2,3, generating superpositions of macroscopic states4, and form essential resources for Quantum-enhanced applications5 such as entanglement distillation6,7 and Quantum computation8, as well as highly efficient optical telecommunications9,10. Realizing the full potential of these hybrid systems requires Quantum-optical measurements sensitive to non-commuting observables such as field quadrature amplitude and photon number11,12,13. However, a thorough understanding of the practical performance of an optical Detector interpolating between these two regions is absent. Here, we report the implementation of full Quantum Detector tomography, enabling the characterization of the simultaneous wave and photon-number sensitivities of Quantum-optical Detectors. This yields the largest parameterization to date in Quantum tomography experiments, requiring the development of novel theoretical tools. Our results reveal the role of coherence in Quantum measurements and demonstrate the tunability of hybrid Quantum-optical Detectors. By developing full Quantum Detector tomography, researchers simultaneously characterize the wave- and photon-number sensitivities of Quantum-optical Detectors to yield the largest ever parametrization in a Quantum tomography experiment. The presented results reveal the role of coherence in Quantum measurements and demonstrate the tunability of hybrid Quantum-optical Detectors.
Martin B Plenio - One of the best experts on this subject based on the ideXlab platform.
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experimental quantification of coherence of a tunable Quantum Detector
Physical Review Letters, 2020Co-Authors: Thomas Theurer, Dario Egloff, Ziwen Liu, Martin B Plenio, Lijian ZhangAbstract:Quantum coherence is a fundamental resource that Quantum technologies exploit to achieve performance beyond that of classical devices. A necessary prerequisite to achieve this advantage is the ability of measurement devices to detect coherence from the measurement statistics. Based on a recently developed resource theory of Quantum operations, here we quantify experimentally the ability of a typical Quantum-optical Detector, the weak-field homodyne Detector, to detect coherence. We derive an improved algorithm for Quantum Detector tomography and apply it to reconstruct the positive-operator-valued measures of the Detector in different configurations. The reconstructed positive-operator-valued measures are then employed to evaluate how well the Detector can detect coherence using two computable measures. As the first experimental investigation of Quantum measurements from a resource theoretical perspective, our work sheds new light on the rigorous evaluation of the performance of a Quantum measurement apparatus.
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recursive Quantum Detector tomography
New Journal of Physics, 2012Co-Authors: Martin B Plenio, Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of Quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states, which begins by reconstructing the diagonals of the operator and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure corresponding to a recently developed
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recursive Quantum Detector tomography
arXiv: Quantum Physics, 2012Co-Authors: Martin B Plenio, Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of Quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states which begins by reconstructing the diagonals of the operator, and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure (POVM) corresponding to a recently developed coherent optical Detector with phase sensitivity and number resolution. We discuss the effect of various parameters on the reconstruction accuracy. The results show the efficiency of the method and its robustness to experimental noise.
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mapping coherence in measurement via full Quantum tomography of a hybrid optical Detector
Nature Photonics, 2012Co-Authors: Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Graciana Puentes, Jeff S Lundeen, Brian J Smith, Martin B PlenioAbstract:Quantum states and measurements exhibit wave-like (continuous) or particle-like (discrete) character. Hybrid discrete–continuous photonic systems are key to investigating fundamental Quantum phenomena1,2,3, generating superpositions of macroscopic states4, and form essential resources for Quantum-enhanced applications5 such as entanglement distillation6,7 and Quantum computation8, as well as highly efficient optical telecommunications9,10. Realizing the full potential of these hybrid systems requires Quantum-optical measurements sensitive to non-commuting observables such as field quadrature amplitude and photon number11,12,13. However, a thorough understanding of the practical performance of an optical Detector interpolating between these two regions is absent. Here, we report the implementation of full Quantum Detector tomography, enabling the characterization of the simultaneous wave and photon-number sensitivities of Quantum-optical Detectors. This yields the largest parameterization to date in Quantum tomography experiments, requiring the development of novel theoretical tools. Our results reveal the role of coherence in Quantum measurements and demonstrate the tunability of hybrid Quantum-optical Detectors. By developing full Quantum Detector tomography, researchers simultaneously characterize the wave- and photon-number sensitivities of Quantum-optical Detectors to yield the largest ever parametrization in a Quantum tomography experiment. The presented results reveal the role of coherence in Quantum measurements and demonstrate the tunability of hybrid Quantum-optical Detectors.
Shuro Izumi - One of the best experts on this subject based on the ideXlab platform.
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projective measurement onto arbitrary superposition of weak coherent state bases
Scientific Reports, 2018Co-Authors: Masahiro Takeoka, Shuro Izumi, Kentaro Wakui, Mikio Fujiwara, Kazuhiro Ema, Masahide SasakiAbstract:One of the peculiar features in Quantum mechanics is that a superposition of macroscopically distinct states can exist. In optical system, this is highlighted by a superposition of coherent states (SCS), i.e. a superposition of classical states. Recently this highly nontrivial Quantum state and its variant have been demonstrated experimentally. Here we demonstrate the superposition of coherent states in Quantum measurement which is also a key concept in Quantum mechanics. More precisely, we propose and implement a projection measurement onto an arbitrary superposition of two weak coherent states in optical system. The measurement operators are reconstructed experimentally by a novel Quantum Detector tomography protocol. Our device is realized by combining the displacement operation and photon counting, well established technologies, and thus has implications in various optical Quantum information processing applications.
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projective measurement onto arbitrary superposition of coherent state bases
arXiv: Quantum Physics, 2017Co-Authors: Shuro Izumi, Masahiro Takeoka, Kentaro Wakui, Mikio Fujiwara, Kazuhiro Ema, Masahide SasakiAbstract:One of the peculiar features in Quantum mechanics is that a superposition of macroscopically distinct states can exits. In optical system, this is highlighted by a superposition of coherent states (SCS), i.e. a superposition of classical states. Recently this highly nontrivial Quantum state and its variant have been demonstrated experimentally. Here we demonstrate the superposition of coherent states in Quantum measurement which is also a key concept in Quantum mechanics. More precisely, we propose and implement a projection measurement onto the arbitrary superposition of the SCS bases in optical system. The measurement operators are reconstructed experimentally by a novel Quantum Detector tomography protocol. Our device is realized by combining the displacement operation and photon counting, well established technologies, and thus has implications in various optical Quantum information processing applications.
Xianmin Jin - One of the best experts on this subject based on the ideXlab platform.
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recursive Quantum Detector tomography
New Journal of Physics, 2012Co-Authors: Martin B Plenio, Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of Quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states, which begins by reconstructing the diagonals of the operator and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure corresponding to a recently developed
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recursive Quantum Detector tomography
arXiv: Quantum Physics, 2012Co-Authors: Martin B Plenio, Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of Quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states which begins by reconstructing the diagonals of the operator, and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure (POVM) corresponding to a recently developed coherent optical Detector with phase sensitivity and number resolution. We discuss the effect of various parameters on the reconstruction accuracy. The results show the efficiency of the method and its robustness to experimental noise.
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mapping coherence in measurement via full Quantum tomography of a hybrid optical Detector
Nature Photonics, 2012Co-Authors: Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Graciana Puentes, Jeff S Lundeen, Brian J Smith, Martin B PlenioAbstract:Quantum states and measurements exhibit wave-like (continuous) or particle-like (discrete) character. Hybrid discrete–continuous photonic systems are key to investigating fundamental Quantum phenomena1,2,3, generating superpositions of macroscopic states4, and form essential resources for Quantum-enhanced applications5 such as entanglement distillation6,7 and Quantum computation8, as well as highly efficient optical telecommunications9,10. Realizing the full potential of these hybrid systems requires Quantum-optical measurements sensitive to non-commuting observables such as field quadrature amplitude and photon number11,12,13. However, a thorough understanding of the practical performance of an optical Detector interpolating between these two regions is absent. Here, we report the implementation of full Quantum Detector tomography, enabling the characterization of the simultaneous wave and photon-number sensitivities of Quantum-optical Detectors. This yields the largest parameterization to date in Quantum tomography experiments, requiring the development of novel theoretical tools. Our results reveal the role of coherence in Quantum measurements and demonstrate the tunability of hybrid Quantum-optical Detectors. By developing full Quantum Detector tomography, researchers simultaneously characterize the wave- and photon-number sensitivities of Quantum-optical Detectors to yield the largest ever parametrization in a Quantum tomography experiment. The presented results reveal the role of coherence in Quantum measurements and demonstrate the tunability of hybrid Quantum-optical Detectors.
H B Coldenstrodtronge - One of the best experts on this subject based on the ideXlab platform.
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Quantum Detector tomography of a time multiplexed superconducting nanowire single photon Detector at telecom wavelengths
Optics Express, 2013Co-Authors: Chandra M Natarajan, Lijian Zhang, H B Coldenstrodtronge, Gaia Donati, Sander N Dorenbos, Val Zwiller, Ian A Walmsley, Robert H HadfieldAbstract:Superconducting nanowire single-photon Detectors (SNSPDs) are widely used in telecom wavelength optical Quantum information science applications. Quantum Detector tomography allows the positive-operator-valued measure (POVM) of a single-photon Detector to be determined. We use an all-fiber telecom wavelength Detector tomography test bed to measure Detector characteristics with respect to photon flux and polarization, and hence determine the POVM. We study the SNSPD both as a binary Detector and in an 8-bin, fiber based, Time-Multiplexed (TM) configuration at repetition rates up to 4 MHz. The corresponding POVMs provide an accurate picture of the photon number resolving capability of the TM-SNSPD.
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recursive Quantum Detector tomography
New Journal of Physics, 2012Co-Authors: Martin B Plenio, Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of Quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states, which begins by reconstructing the diagonals of the operator and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure corresponding to a recently developed
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recursive Quantum Detector tomography
arXiv: Quantum Physics, 2012Co-Authors: Martin B Plenio, Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of Quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states which begins by reconstructing the diagonals of the operator, and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure (POVM) corresponding to a recently developed coherent optical Detector with phase sensitivity and number resolution. We discuss the effect of various parameters on the reconstruction accuracy. The results show the efficiency of the method and its robustness to experimental noise.
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mapping coherence in measurement via full Quantum tomography of a hybrid optical Detector
Nature Photonics, 2012Co-Authors: Lijian Zhang, H B Coldenstrodtronge, Animesh Datta, Xianmin Jin, Graciana Puentes, Jeff S Lundeen, Brian J Smith, Martin B PlenioAbstract:Quantum states and measurements exhibit wave-like (continuous) or particle-like (discrete) character. Hybrid discrete–continuous photonic systems are key to investigating fundamental Quantum phenomena1,2,3, generating superpositions of macroscopic states4, and form essential resources for Quantum-enhanced applications5 such as entanglement distillation6,7 and Quantum computation8, as well as highly efficient optical telecommunications9,10. Realizing the full potential of these hybrid systems requires Quantum-optical measurements sensitive to non-commuting observables such as field quadrature amplitude and photon number11,12,13. However, a thorough understanding of the practical performance of an optical Detector interpolating between these two regions is absent. Here, we report the implementation of full Quantum Detector tomography, enabling the characterization of the simultaneous wave and photon-number sensitivities of Quantum-optical Detectors. This yields the largest parameterization to date in Quantum tomography experiments, requiring the development of novel theoretical tools. Our results reveal the role of coherence in Quantum measurements and demonstrate the tunability of hybrid Quantum-optical Detectors. By developing full Quantum Detector tomography, researchers simultaneously characterize the wave- and photon-number sensitivities of Quantum-optical Detectors to yield the largest ever parametrization in a Quantum tomography experiment. The presented results reveal the role of coherence in Quantum measurements and demonstrate the tunability of hybrid Quantum-optical Detectors.
