Quantum Zeno stabilization in weak continuous measurement of two qubits
نویسندگان
چکیده
منابع مشابه
Quantum Zeno stabilization in weak continuous measurement of two qubits
We have studied quantum coherent oscillations of two qubits under continuous measurement by a symmetrically coupled mesoscopic detector. The analysis is based on a Bayesian formalism that is applicable to individual quantum systems. Measurement continuously collapses the two-qubit system to one of the subspaces of the Bell basis. For a detector with linear response this corresponds to measureme...
متن کاملWeak measurement of quantum dot spin qubits
The theory of weak quantum measurements is developed for quantum dot spin qubits. Building on recent experiments, we propose a control cycle to prepare, manipulate, weakly measure, and perform quantum state tomography. This is accomplished using a combination of the physics of electron spin resonance, spin blockade, and Coulomb blockade, resulting in a charge transport process. We investigate t...
متن کاملContinuous weak measurement of quantum coherent oscillations
We consider the problem of continuous quantum measurement of coherent oscillations between two quantum states of an individual two-state system. It is shown that the interplay between the information acquisition and the backaction dephasing of the oscillations by the detector imposes a fundamental limit, equal to four, on the signal-to-noise ratio of the measurement. The limit is universal, e.g...
متن کاملContinuous measurement of entangled qubits
The problem of quantum measurement of a qubit ~twolevel system! received renewed attention recently in relation to its importance for quantum computing. The case of sufficiently fast ~instantaneous! measurement can be readily described by ‘‘orthodox’’ collapse postulate @1#, and this is the case assumed at present by all quantum algorithms. However, in practice, especially for solid-state qubit...
متن کاملZeno phenomena : pulsed versus continuous measurement
The time evolution of an unstable quantum mechanical system coupled with an external measuring agent is investigated. According to the features of the interaction Hamiltonian, a quantum Zeno effect (hindered decay) or an inverse quantum Zeno effect (accelerated decay) can take place, depending on the response time of the apparatus. The transition between the two regimes is analyzed for both pul...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2006
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.73.085317