Direct characterization of quantum dynamics with noisy ancilla

Journal Article · Mon Nov 23 00:00:00 EST 2015 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.92.052329· OSTI ID:1235832

Dumitrescu, Eugene F. ^[1]; Humble, Travis S. ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

We present methods for the direct characterization of quantum dynamics (DCQD) in which both the principal and ancilla systems undergo noisy processes. Using a concatenated error detection code, we discriminate between located and unlocated errors on the principal system in what amounts to filtering of ancilla noise. The example of composite noise involving amplitude damping and depolarizing channels is used to demonstrate the method, while we find the rate of noise filtering is more generally dependent on code distance. Furthermore our results indicate the accuracy of quantum process characterization can be greatly improved while remaining within reach of current experimental capabilities.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-00OR22725; AC0500OR22725
• OSTI ID: 1235832
• Alternate ID(s): OSTI ID: 1226862
• Journal Information: Physical Review. A, Vol. 92, Issue 5; ISSN 1050-2947
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
quantum information
quantum computing
error correction
quantum physics