Journal Article

FZJ-2014-05511

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dispersive Qubit Measurement by Interferometry with Parametric Amplifiers

Barzanjeh, S. (Corresponding Author) ; DiVincenzo, D.FZJ* ; Terhal, B. M.

2014
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/8052  doi:10.1103/PhysRevB.90.134515

Abstract: We perform a detailed analysis of how an amplified interferometer can be used to enhance the quality of a dispersive qubit measurement, such as one performed on a superconducting transmon qubit, using homodyne detection on an amplified microwave signal. Our modeling makes a realistic assessment of what is possible in current circuit-QED experiments; in particular, we take into account the frequency-dependence of the qubit-induced phase shift for short microwaves pulses. We compare the possible signal-to-noise ratios obtainable with (single-mode) SU(1,1) interferometers with the current coherent measurement and find a considerable reduction in measurement error probability in an experimentally-accessible range of parameters.

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Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)
2. Theoretische Nanoelektronik (IAS-3)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 422 - Spin-based and quantum information (POF2-422) (POF2-422)

Appears in the scientific report 2014

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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