ABSTRACT Via explicit examples we show that the pre-existing entanglement can really enhance (not... more ABSTRACT Via explicit examples we show that the pre-existing entanglement can really enhance (not only behave as an assistance for) the efficiency of the quantum error-correcting codes (QECCs) in a single block of encoding or decoding as well as help in beating the quantum Hamming bound. A systematic approach to constructing entanglement-assisted (or enhanced) quantum error-correcting codes (EAQECCs) via graph states is also presented, and an infinite family of entanglement-enhanced codes has been constructed. Furthermore we generalize the EAQECCs to the case of not-so-perfectly protected qubit and introduce the quantity infidelity as a figure of merit and show that the EAQECCs also outperform the ordinary QECCs.
We provide a systematic way of constructing entanglement-assisted quantum error-correcting codes ... more We provide a systematic way of constructing entanglement-assisted quantum error-correcting codes via graph states in the scenario of preexisting perfectly protected qubits. It turns out that the preexisting entanglement can help beat the quantum Hamming bound and can enhance (not only behave as an assistance) the performance of the quantum error correction. Furthermore we generalize the error models to the case of not-so-perfectly-protected qubits and introduce the quantity infidelity as a figure of merit and show that our code outperforms also the ordinary quantum error-correcting codes.
The trade-offs among various output fidelities of asymmetric universal cloning machines are inves... more The trade-offs among various output fidelities of asymmetric universal cloning machines are investigated. First we find out all the attainable optimal output fidelities for the 1 to 3 asymmetric universal cloning machine and it turns out that there are two kinds of extremal machines which have to cooperate in order to achieve some of the optimal output fidelities. Second we construct a family of extremal cloning machines that includes the universal symmetric cloning machine as well as an asymmetric 1 to 1+N cloning machine for qudits with two different output fidelities such that the optimal trade-off between the measurement disturbance and state estimation is attained in the limit of infinite N.
The purpose of this study was to find what factors were associated with students' perceptions of ... more The purpose of this study was to find what factors were associated with students' perceptions of learning in online courses. Survey data were collected from students enrolled in 78 courses offered through the SUNY (State University of New York) Learning Network in the fall of 1997. Correlation and multiple regression analyses were employed. The dependent variable was students' perceived learning that was correlated with the following 11 independent variables: instructor-student interaction; instructor-student communication; instructor evaluation; instructor responses; student-student interaction; student-student communication; online discussion; written assignments; learning style; prior computer competency; and time spent on a course. Results indicate that the amount of student-instructor interaction and the online discussion activity played an important role in predicting students' perceived learning. The implication of this finding is that it is not only important to create an interactive environment for learning, but it is also important to design discussion activities that can trigger rich and meaningful online discourse. (Contains 16 references.) (Author/MES) Reproductions supplied by EDRS are the best that can be made from the original document.
A Study of Factors Influencing Students' Perceived Learning in a Web-Based Course Environment
... For most of these teachers, being able to guide learning by asking the right questions is v... more ... For most of these teachers, being able to guide learning by asking the right questions is viewed as more important than ... A Study of Factors Influencing Students' Perceived Learning Table 2 Data from the 17* SLN Web-Based Courses (in random order) for Correlation Analysis ...
ABSTRACT Via explicit examples we show that the pre-existing entanglement can really enhance (not... more ABSTRACT Via explicit examples we show that the pre-existing entanglement can really enhance (not only behave as an assistance for) the efficiency of the quantum error-correcting codes (QECCs) in a single block of encoding or decoding as well as help in beating the quantum Hamming bound. A systematic approach to constructing entanglement-assisted (or enhanced) quantum error-correcting codes (EAQECCs) via graph states is also presented, and an infinite family of entanglement-enhanced codes has been constructed. Furthermore we generalize the EAQECCs to the case of not-so-perfectly protected qubit and introduce the quantity infidelity as a figure of merit and show that the EAQECCs also outperform the ordinary QECCs.
We provide a systematic way of constructing entanglement-assisted quantum error-correcting codes ... more We provide a systematic way of constructing entanglement-assisted quantum error-correcting codes via graph states in the scenario of preexisting perfectly protected qubits. It turns out that the preexisting entanglement can help beat the quantum Hamming bound and can enhance (not only behave as an assistance) the performance of the quantum error correction. Furthermore we generalize the error models to the case of not-so-perfectly-protected qubits and introduce the quantity infidelity as a figure of merit and show that our code outperforms also the ordinary quantum error-correcting codes.
The trade-offs among various output fidelities of asymmetric universal cloning machines are inves... more The trade-offs among various output fidelities of asymmetric universal cloning machines are investigated. First we find out all the attainable optimal output fidelities for the 1 to 3 asymmetric universal cloning machine and it turns out that there are two kinds of extremal machines which have to cooperate in order to achieve some of the optimal output fidelities. Second we construct a family of extremal cloning machines that includes the universal symmetric cloning machine as well as an asymmetric 1 to 1+N cloning machine for qudits with two different output fidelities such that the optimal trade-off between the measurement disturbance and state estimation is attained in the limit of infinite N.
The purpose of this study was to find what factors were associated with students' perceptions of ... more The purpose of this study was to find what factors were associated with students' perceptions of learning in online courses. Survey data were collected from students enrolled in 78 courses offered through the SUNY (State University of New York) Learning Network in the fall of 1997. Correlation and multiple regression analyses were employed. The dependent variable was students' perceived learning that was correlated with the following 11 independent variables: instructor-student interaction; instructor-student communication; instructor evaluation; instructor responses; student-student interaction; student-student communication; online discussion; written assignments; learning style; prior computer competency; and time spent on a course. Results indicate that the amount of student-instructor interaction and the online discussion activity played an important role in predicting students' perceived learning. The implication of this finding is that it is not only important to create an interactive environment for learning, but it is also important to design discussion activities that can trigger rich and meaningful online discourse. (Contains 16 references.) (Author/MES) Reproductions supplied by EDRS are the best that can be made from the original document.
A Study of Factors Influencing Students' Perceived Learning in a Web-Based Course Environment
... For most of these teachers, being able to guide learning by asking the right questions is v... more ... For most of these teachers, being able to guide learning by asking the right questions is viewed as more important than ... A Study of Factors Influencing Students' Perceived Learning Table 2 Data from the 17* SLN Web-Based Courses (in random order) for Correlation Analysis ...
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