Effect of ancilla's structure on quantum error correction using the seven-qubit Calderbank-Shor-Steane code
- Departamento Tecnologias Especiales Aplicadas a la Telecomunicacion (Spain)
- Departamento Fisica Aplicada a las Tecnologias de la Informacion, ETSI Telecomunicacion, UPM, Ciudad Universitaria s/n, 28040 Madrid (Spain)
In this work we discuss the ability of different types of ancillas to control the decoherence of a qubit interacting with an environment. The error is introduced into the numerical simulation via a depolarizing isotropic channel. The ranges of values considered are 10{sup -4}{<=}{epsilon}{<=}10{sup -2} for memory errors and 3x10{sup -5}{<=}{gamma}/7{<=}10{sup -2} for gate errors. After the correction we calculate the fidelity as a quality criterion for the qubit recovered. We observe that a recovery method with a three-qubit ancilla provides reasonably good results bearing in mind its economy. If we want to go further, we have to use fault tolerant ancillas with a high degree of parallelism, even if this condition implies introducing additional ancilla verification qubits.
- OSTI ID:
- 20641135
- Journal Information:
- Physical Review. A, Vol. 69, Issue 5; Other Information: DOI: 10.1103/PhysRevA.69.052322; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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