Measuring Controlled-NOT and two-qubit gate operation

Measuring Controlled-NOT and two-qubit gate operation

Accurate characterisation of two-qubit gates will be critical for any realisation of quantum computation. We discuss a range of measurements aimed at characterising a two-qubit gate, specifically the CNOT gate. These measurements are architecture-independent, and range from simple truth table measur...

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Veröffentlicht in:arXiv.org 2003-08
Hauptverfasser: White, Andrew G, Gilchrist, Alexei, Pryde, Geoffrey J, O'Brien, Jeremy L, Bremner, Michael J, Langford, Nathan K
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Quantum entanglement
Quantum theory
Qubits (quantum computing)
Rangefinding
Visibility
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creator White, Andrew G
Gilchrist, Alexei
Pryde, Geoffrey J
O'Brien, Jeremy L
Bremner, Michael J
Langford, Nathan K
description Accurate characterisation of two-qubit gates will be critical for any realisation of quantum computation. We discuss a range of measurements aimed at characterising a two-qubit gate, specifically the CNOT gate. These measurements are architecture-independent, and range from simple truth table measurements, to single figure measures such as the fringe visibility, parity, fidelity, and entanglement witnesses, through to whole-state and whole-gate measures achieved respectively via quantum state and process tomography. In doing so, we examine critical differences between classical and quantum gate operation.
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subjects Quantum entanglement
Quantum theory
Qubits (quantum computing)
Rangefinding
Visibility
title Measuring Controlled-NOT and two-qubit gate operation
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