Quantum circuits with mixed states
STOC '98 Proceedings of the thirtieth annual ACM symposium on Theory of computing
Quantum computation and quantum information
Quantum computation and quantum information
Classical and Quantum Computation
Classical and Quantum Computation
Geometry of Quantum States: An Introduction to Quantum Entanglement
Geometry of Quantum States: An Introduction to Quantum Entanglement
Distinguishing quantum operations having few Kraus operators
Quantum Information & Computation
Sub- and super-fidelity as bounds for quantum fidelity
Quantum Information & Computation
Depolarizing behavior of quantum channels in higher dimensions
Quantum Information & Computation
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We present two measures of distance between quantum processes which can be measured directly in laboratory without resorting to process tomography. The measures are based on the superfidelity, introduced recently to provide an upper bound for quantum fidelity. We show that the introduced measures partially fulfill the requirements for distance measure between quantum processes. We also argue that they can be especially useful as diagnostic measures to get preliminary knowledge about imperfections in an experimental setup. In particular we provide quantum circuit which can be used to measure the superfidelity between quantum processes. We also provide a physical interpretation of the introduced metrics based on the continuity of channel capacity.