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  4. Experimental QND measurements of complementarity on two-qubit states with IonQ and IBM Q quantum computers
 
research article

Experimental QND measurements of complementarity on two-qubit states with IonQ and IBM Q quantum computers

Schwaller, Nicolas
•
Vento, Valeria  
•
Galland, Christophe  
February 1, 2022
Quantum Information Processing

We report the experimental nondemolition measurement of coherence, predictability and concurrence on a system of two qubits. The quantum circuits proposed by De Melo et al. (Phys Rev Lett 98(25):250501, 2007) are implemented on IBM Q (superconducting circuit) and IonQ (trapped ion) quantum computers. Three criteria are used to compare the performance of the different machines on this task: measurement accuracy, nondemolition of the observable, and quantum state preparation. We find that the IonQ quantum computer provides constant state fidelity through the nondemolition process, outperforming IBM Q systems on which the fidelity consequently drops after the measurement. Our study compares the current performance of these two technologies at different stages of the nondemolition measurement of bipartite complementarity.

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Type
research article
DOI
10.1007/s11128-021-03354-z
Web of Science ID

WOS:000748319000001

Author(s)
Schwaller, Nicolas
Vento, Valeria  
Galland, Christophe  
Date Issued

2022-02-01

Publisher

SPRINGER

Published in
Quantum Information Processing
Volume

21

Issue

2

Start page

75

Subjects

Quantum Science & Technology

•

Physics, Multidisciplinary

•

Physics, Mathematical

•

Physics

•

quantum nondemolition (qnd)

•

complementarity

•

entanglement

•

qubits

•

trapped ions

•

superconducting

•

ionq

•

ibm q

•

fidelity

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GR-GA  
Available on Infoscience
February 14, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/185315
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