The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Paola Cappellaro - One of the best experts on this subject based on the ideXlab platform.
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Time-optimal control with Finite Bandwidth
Quantum Information Processing, 2018Co-Authors: Masashi Hirose, Paola CappellaroAbstract:Time-optimal control theory provides recipes to achieve quantum operations with high fidelity and speed, as required in quantum technologies such as quantum sensing and computation. While technical advances have achieved the ultrastrong driving regime in many physical systems, these capabilities have yet to be fully exploited for the precise control of quantum systems, as other limitations, such as the generation of higher harmonics or the Finite response time of the control apparatus, prevent the implementation of theoretical time-optimal control. Here we present a method to achieve time-optimal control of qubit systems that can take advantage of fast driving beyond the rotating wave approximation. We exploit results from time-optimal control theory to design driving protocols that can be implemented with realistic, Finite-Bandwidth control fields, and we find a relationship between Bandwidth limitations and achievable control fidelity.
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time optimal control with Finite Bandwidth
arXiv: Quantum Physics, 2015Co-Authors: Masashi Hirose, Paola CappellaroAbstract:Optimal control theory provides recipes to achieve quantum operations with high fidelity and speed, as required in quantum technologies such as quantum sensing and computation. While technical advances have achieved the ultrastrong driving regime in many physical systems, these capabilities have yet to be fully exploited for the precise control of quantum systems, as other limitations, such as the generation of higher harmonics or the Finite Bandwidth of the control fields, prevent the implementation of theoretical time-optimal control. Here we present a method to achieve time-optimal control of qubit systems that can take advantage of fast driving beyond the rotating wave approximation. We exploit results from optimal control theory to design driving protocols that can be implemented with realistic, Finite-Bandwidth control and we find a relationship between Bandwidth limitations and achievable control fidelity.
M H Naderi - One of the best experts on this subject based on the ideXlab platform.
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response of a mechanical oscillator in an optomechanical cavity driven by a Finite Bandwidth squeezed vacuum excitation
Physical Review A, 2016Co-Authors: H Lotfipour, S Shahidani, R Roknizadeh, M H NaderiAbstract:In this paper, we theoretically investigate the displacement and momentum fluctuations spectra of the movable mirror in a standard optomechanical system driven by a Finite-Bandwidth squeezed vacuum light accompanying a coherent laser field. Two cases in which the squeezed vacuum is generated by degenerate and nondegenerate parametric oscillators (DPO and NDPO) are considered. We find that for the case of Finite-Bandwidth squeezed vacuum injection, the two spectra exhibit unique features, which strongly differ from those of broadband squeezing excitation. In particular, the spectra exhibit a three-peaked and a four-peaked structure, respectively, for the squeezing injection from DPO and NDPO. Besides, some anomalous characteristics of the spectra such as squeezing-induced pimple, hole burning, and dispersive profile are found to be highly sensitive to the squeezing parameters and the temperature of the mirror. We also evaluate the mean-square fluctuations in position and momentum quadratures of the movable mirror and analyze the influence of the squeezing parameters of the input field on the mechanical squeezing. It will be shown that the parameters of driven squeezed vacuum affects the squeezing. We find the optimal mechanical squeezing is achievable via Finite-Bandwidth squeezed vacuum injection which is affected by the intensity of squeezed vacuum. We also show that the phase of incident squeezed vacuum determines whether position or momentum squeezing occurs. Our proposed scheme not only provides a feasible experimental method to detect and characterize squeezed light by optomechanical systems, but also suggests a way for controllable transfer of squeezing from an optical field to a mechanical oscillator.
Masashi Hirose - One of the best experts on this subject based on the ideXlab platform.
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Time-optimal control with Finite Bandwidth
Quantum Information Processing, 2018Co-Authors: Masashi Hirose, Paola CappellaroAbstract:Time-optimal control theory provides recipes to achieve quantum operations with high fidelity and speed, as required in quantum technologies such as quantum sensing and computation. While technical advances have achieved the ultrastrong driving regime in many physical systems, these capabilities have yet to be fully exploited for the precise control of quantum systems, as other limitations, such as the generation of higher harmonics or the Finite response time of the control apparatus, prevent the implementation of theoretical time-optimal control. Here we present a method to achieve time-optimal control of qubit systems that can take advantage of fast driving beyond the rotating wave approximation. We exploit results from time-optimal control theory to design driving protocols that can be implemented with realistic, Finite-Bandwidth control fields, and we find a relationship between Bandwidth limitations and achievable control fidelity.
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time optimal control with Finite Bandwidth
arXiv: Quantum Physics, 2015Co-Authors: Masashi Hirose, Paola CappellaroAbstract:Optimal control theory provides recipes to achieve quantum operations with high fidelity and speed, as required in quantum technologies such as quantum sensing and computation. While technical advances have achieved the ultrastrong driving regime in many physical systems, these capabilities have yet to be fully exploited for the precise control of quantum systems, as other limitations, such as the generation of higher harmonics or the Finite Bandwidth of the control fields, prevent the implementation of theoretical time-optimal control. Here we present a method to achieve time-optimal control of qubit systems that can take advantage of fast driving beyond the rotating wave approximation. We exploit results from optimal control theory to design driving protocols that can be implemented with realistic, Finite-Bandwidth control and we find a relationship between Bandwidth limitations and achievable control fidelity.
David Vitali - One of the best experts on this subject based on the ideXlab platform.
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mechanical einstein podolsky rosen entanglement with a Finite Bandwidth squeezed reservoir
Physical Review A, 2016Co-Authors: Muhammad Asjad, Stefano Zippilli, David VitaliAbstract:We describe a scheme for entangling mechanical resonators which is efficient also beyond the resolved sideband regime. It employs the radiation pressure force of the squeezed light produced by a degenerate optical parametric oscillator, which acts as a reservoir of quantum correlations (squeezed reservoir), and it is effective when the spectral Bandwidth of the reservoir and the fields frequencies are appropriately selected. It allows for the steady state preparation of mechanical resonatrs in entangled EPR states and can be extended to the preparation of many entangled pairs of resonators which interact with the same light field, in a situation in which the optomechanical system realizes a star-like harmonic network.
A Baschirotto - One of the best experts on this subject based on the ideXlab platform.
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behavioral modeling of switched capacitor sigma delta modulators
IEEE Transactions on Circuits and Systems I-regular Papers, 2003Co-Authors: P Malcovati, S Brigati, F Francesconi, Franco Maloberti, Paolo Cusinato, A BaschirottoAbstract:This paper presents a complete set of blocks implemented in the popular MATLAB SIMULINK environment, which allows designers to perform time-domain behavioral simulations of switched-capacitor (SC) sigma-delta (/spl Sigma//spl Delta/) modulators. The proposed set of blocks takes into account most of the SC /spl Sigma//spl Delta/ modulator nonidealities, such as sampling jitter, kT/C noise, and operational amplifier parameters (white noise, Finite DC gain, Finite Bandwidth, slew rate and saturation voltages). For each block, a description of the considered effect as well as all of the implementative details are provided. The proposed simulation environment is validated by comparing the simulated behavior with the experimental results obtained from two actual circuits, namely a second-order low-pass and a sixth-order bandpass SC /spl Sigma//spl Delta/ modulator.
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modeling sigma delta modulator non idealities in simulink r
International Symposium on Circuits and Systems, 1999Co-Authors: S Brigati, F Francesconi, P Malcovati, Davide Tonietto, A Baschirotto, Franco MalobertiAbstract:This paper presents a complete set of SIMULINK(R) models, which allow exhaustive behavioral simulations of any sigma-delta modulator to be performed. The proposed set of models takes into account most of the sigma-delta modulator non-idealities, such as sampling jitter, kT/C noise and operational amplifier parameters (noise, Finite gain, Finite Bandwidth, slew-rate and saturation voltages). For each model we present a description of the considered effect as well as all of the implementative details. Simulation results on a second-order switched-capacitor sigma-delta modulator demonstrate the validity of the models proposed.
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modeling sigma delta modulator non idealities in simulink
1999Co-Authors: S Brigati, F Francesconi, P Malcovati, Davide Tonietto, A Baschirotto, Franco Maloberti, Piazza G Marconi, Clock JitterAbstract:This paper presents a complete set of SIMULINK ® models, which allow exhaustive behavioral simulations of any sigma-delta modulator to be performed. The proposed set of models takes into account most of the sigma-delta modulator non-idealities, such as sampling jitter, kT/C noise and operational amplifier parameters (noise, Finite gain, Finite Bandwidth, slew-rate and saturation voltages). For each model we present a description of the considered effect as well as all of the implementative details. Simulation results on a second-order switched-capacitor sigma-delta modulator demonstrate the validity of the models proposed.
