Parity meter for charge qubits: an efficient quantum entangler
arXiv:cond-mat/0602514 · doi:10.1103/PhysRevB.73.235331
Abstract
We propose a realization of a charge parity meter based on two double quantum dots alongside a quantum point contact. Such a device is a specific example of the general class of mesoscopic quadratic quantum measurement detectors previously investigated by Mao et al. [Phys. Rev. Lett. 93, 056803 (2004)]. Our setup accomplishes entangled state preparation by a current measurement alone, and allows the qubits to be effectively decoupled by pinching off the parity meter. Two applications of the parity meter are discussed: the measurement of Bell's inequality in charge qubits and the realization of a controlled NOT gate.
8 pages, 4 figures; v2: discussion of measurement time, references added
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- Generalized parity measurements
- Entanglement between static and flying qubits in an Aharonov-Bohm double electrometer
- Analysis of Bell inequality violation in superconducting qubits
- Weak measurement of quantum dot spin qubits
- Weak Measurements with Entangled Probes
- Reduced dynamics with renormalization in solid-state charge qubit measurement
- Measuring the squared magnetisation of a molecule