| Autor: |
Barzanjeh, Sh., DiVincenzo, D. P., Terhal, B. M. |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 90, 134515(2014) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.90.134515 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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