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Scientific article
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Parity meter for charge qubits : an efficient quantum entangler

Publication date2006
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.

Keywords
  • Quantum point contacts
  • Quantum dots
  • Quantum entanglement
Citation (ISO format)
TRAUZETTEL, B. et al. Parity meter for charge qubits : an efficient quantum entangler. In: Physical review. B, Condensed matter and materials physics, 2006, vol. 73, n° 235331, p. 7. doi: 10.1103/PhysRevB.73.235331
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ISSN of the journal1098-0121
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