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- Title
Experimental QND measurements of complementarity on two-qubit states with IonQ and IBM Q quantum computers.
- Authors
Schwaller, Nicolas; Vento, Valeria; Galland, Christophe
- Abstract
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.
- Subjects
INTERNATIONAL Business Machines Corp.; QUANTUM states; ION traps; QUBITS; SUPERCONDUCTING circuits; PERFORMANCE technology; MACHINE performance; QUANTUM computers
- Publication
Quantum Information Processing, 2022, Vol 21, Issue 2, p1
- ISSN
1570-0755
- Publication type
Article
- DOI
10.1007/s11128-021-03354-z