The Experts below are selected from a list of 191646 Experts worldwide ranked by ideXlab platform
Cody Jones - One of the best experts on this subject based on the ideXlab platform.
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Surface Code Implementation of block Code state distillation.
Scientific Reports, 2013Co-Authors: Austin G. Fowler, Simon J. Devitt, Cody JonesAbstract:State distillation is the process of taking a number of imperfect copies of a particular quantum state and producing fewer better copies. Until recently, the lowest overhead method of distilling states produced a single improved [formula: see text] state given 15 input copies. New block Code state distillation methods can produce k improved [formula: see text] states given 3k + 8 input copies, potentially significantly reducing the overhead associated with state distillation. We construct an explicit surface Code Implementation of block Code state distillation and quantitatively compare the overhead of this approach to the old. We find that, using the best available techniques, for parameters of practical interest, block Code state distillation does not always lead to lower overhead, and, when it does, the overhead reduction is typically less than a factor of three.
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surface Code Implementation of block Code state distillation
arXiv: Quantum Physics, 2013Co-Authors: Austin G. Fowler, Simon J. Devitt, Cody JonesAbstract:State distillation is the process of taking a number of imperfect copies of a particular quantum state and producing fewer better copies. Until recently, the lowest overhead method of distilling states |A>=(|0>+e^{i\pi/4}|1>)/\sqrt{2} produced a single improved |A> state given 15 input copies. New block Code state distillation methods can produce k improved |A> states given 3k+8 input copies, potentially significantly reducing the overhead associated with state distillation. We construct an explicit surface Code Implementation of block Code state distillation and quantitatively compare the overhead of this approach to the old. We find that, using the best available techniques, for parameters of practical interest, block Code state distillation does not always lead to lower overhead, and, when it does, the overhead reduction is typically less than a factor of three.
Alfred Mertins - One of the best experts on this subject based on the ideXlab platform.
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space time frequency Code Implementation in mb ofdm uwb communications design criteria and performance
IEEE Transactions on Wireless Communications, 2009Co-Authors: Le Chung Tran, Alfred MertinsAbstract:This paper proposes a general framework of space-time-frequency Codes (STFCs) for multi-band orthogonal frequency division multiplexing (MB-OFDM) ultra-wide band (UWB) communications systems. A great similarity between the STFC MB-OFDM UWB systems and conventional wireless complex orthogonal space-time block Code (CO STBC) multiple-input multiple-output (MIMO) systems is discovered. This allows us to quantify the pairwise error probability (PEP) of the proposed system and derive the general decoding method for the implemented STFCs. Based on the theoretical analysis results of PEP, we can further quantify the diversity order and coding gain of MB-OFDM UWB systems, and derive the design criteria for STFCs, namely diversity gain criterion and coding gain criterion. The maximum achievable diversity order is found to be the product of the number of transmit antennas, the number of receive antennas, and the FFT size. We also show that all STFCs constructed based on the conventional CO STBCs can satisfy the diversity gain criterion. Various baseband simulation results are shown for the Alamouti Code and a Code of order 8. Simulation results indicate the significant improvement achieved in the proposed STFC MB-OFDM UWB systems, compared to the conventional MB-OFDM UWB ones.
Marc Brendel - One of the best experts on this subject based on the ideXlab platform.
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Flow field in a low-speed axial fan: a DPIV investigation
Experimental Thermal and Fluid Science, 2000Co-Authors: Jordi Estevadeordal, Sivaram Gogineni, William W. Copenhaver, G Bloch, Marc BrendelAbstract:Abstract The characteristics of the flow in a low-speed axial fan were investigated using digital particle image velocimetry (DPIV). Instantaneous and time-averaged velocity measurements were made at the leading-edge, trailing-edge, and suction and pressure sides of the blade by synchronizing the passage of the blade with the laser and camera system. These measurements revealed steady and unsteady flow features at several operating points and allowed a composite DPIV image around the entire fan blade to be made. This composite image was compared with a panel Code solution, and the main differences found between them were attributed to local viscous effects such as flow separation and wake unsteadiness that are not included in the present panel Code Implementation.
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FLOW STRUCTURE IN A LOW-SPEED AXIAL FAN: A DPIV INVESTIGATION
29th AIAA Fluid Dynamics Conference, 1998Co-Authors: Jordi Estevadeordal, Sivaram Gogineni, William W. Copenhaver, G Bloch, Marc BrendelAbstract:The characteristics of the flow in a low-speed axial fan were investigated using Digital Particle Image Velocimetry (DPIV). Instantaneous and time-averaged velocity measurements were made at the leading-edge, trailing-wake, and suction and pressure sides of the blade by synchronizing the passage of the blade with the laser and camera system. These measurements revealed steady and unsteady flow features at several operating points and allowed a composite DPIV image around the entire fan blade to be made. This composite image was compared with a panel Code solution, and the main differences found between them were attributed to local viscous effects such as flow separation and wake unsteadiness that are not included in the present panel Code Implementation. Nomenclature
D.f. Freeman - One of the best experts on this subject based on the ideXlab platform.
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Viterbi decoding of the (63, 57) Hamming Code-Implementation and performance results
IEEE Transactions on Communications, 1995Co-Authors: Arnold M. Michelson, D.f. FreemanAbstract:Use of the Viterbi deCoder to deCode the (63, 57) Hamming Code is considered, Implementation and performance of systematic and nonsystematic Codes are addressed. It is shown that a Viterbi deCoder for the constraint length seven, rate- 1/2 convolutional Code can be used to deCode both systematic and nonsystematic (63, 57) Hamming Codes, but an additional step is needed to complete the decoding of the systematic Code. Bounds and simulation results for postdecoding bit-error probability are given and it is shown that the systematic Code performs 0.4 dB better than the nonsystematic Code. A heuristic explanation is provided.
Austin G. Fowler - One of the best experts on this subject based on the ideXlab platform.
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Surface Code Implementation of block Code state distillation.
Scientific Reports, 2013Co-Authors: Austin G. Fowler, Simon J. Devitt, Cody JonesAbstract:State distillation is the process of taking a number of imperfect copies of a particular quantum state and producing fewer better copies. Until recently, the lowest overhead method of distilling states produced a single improved [formula: see text] state given 15 input copies. New block Code state distillation methods can produce k improved [formula: see text] states given 3k + 8 input copies, potentially significantly reducing the overhead associated with state distillation. We construct an explicit surface Code Implementation of block Code state distillation and quantitatively compare the overhead of this approach to the old. We find that, using the best available techniques, for parameters of practical interest, block Code state distillation does not always lead to lower overhead, and, when it does, the overhead reduction is typically less than a factor of three.
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surface Code Implementation of block Code state distillation
arXiv: Quantum Physics, 2013Co-Authors: Austin G. Fowler, Simon J. Devitt, Cody JonesAbstract:State distillation is the process of taking a number of imperfect copies of a particular quantum state and producing fewer better copies. Until recently, the lowest overhead method of distilling states |A>=(|0>+e^{i\pi/4}|1>)/\sqrt{2} produced a single improved |A> state given 15 input copies. New block Code state distillation methods can produce k improved |A> states given 3k+8 input copies, potentially significantly reducing the overhead associated with state distillation. We construct an explicit surface Code Implementation of block Code state distillation and quantitatively compare the overhead of this approach to the old. We find that, using the best available techniques, for parameters of practical interest, block Code state distillation does not always lead to lower overhead, and, when it does, the overhead reduction is typically less than a factor of three.