## Quantum Measurement and ControlThe control of individual quantum systems promises a new technology for the 21st century - quantum technology. This book is the first comprehensive treatment of modern quantum measurement and measurement-based quantum control, which are vital elements for realizing quantum technology. Readers are introduced to key experiments and technologies through dozens of recent experiments in cavity QED, quantum optics, mesoscopic electronics, and trapped particles several of which are analyzed in detail. Nearly 300 exercises help build understanding, and prepare readers for research in these exciting areas. This important book will interest graduate students and researchers in quantum information, quantum metrology, quantum control and related fields. Novel topics covered include adaptive measurement; realistic detector models; mesoscopic current detection; Markovian, state-based and optimal feedback; and applications to quantum information processing. |

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### Contents

Quantum parameter estimation | 51 |

Open quantum systems | 97 |

Quantum trajectories | 148 |

Quantum feedback control | 216 |

Statebased quantum feedback control | 269 |

Applications to quantum information processing | 341 |

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### Common terms and phrases

adaptive amplitude apparatus approximation arbitrary assume atom basis bath beam-splitter Bloch sphere cavity classical coherent commutation relations conditioned conﬁguration consider correlation decoherence deﬁned deﬁnition derived described detector discussed in Section dynamics efﬁcient eigenstates eigenvalues electron encoding ensemble entangled estimate evolution example Exercise experimental feedback control ﬁdelity ﬁeld ﬁnal ﬁnd ﬁnite ﬁrst ﬁxed ﬂuctuations frequency function Gaussian Hamiltonian Heisenberg picture Hermitian heterodyne Hilbert space homodyne detection inﬁnite inﬁnitesimal initial input interaction frame jumps linear Markovian feedback master equation matrix mean measurement operators measurement results mode noise observable obtain open quantum systems optimal output parameter phase photocurrent photon photon number Phys physical probability distribution projective measurement quadrature quantum computation quantum dot quantum feedback quantum measurement quantum mechanics quantum optics quantum system quantum trajectory qubit satisﬁed Show simply solution squeezing stabilizer stochastic superoperator teleportation term theory unconditioned unitary vacuum variable variance vector zero