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A. Marquet

As seen in: Nature, Physical Review B
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Articles by A. Marquet

Enhancing bosonic qubit protection by squeezing

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By R. Rousseau, D. Ruiz, G. Cardoso, A. Essig, E. Gouzien, A. Gras, A. N. Jacob, A. Marquet, U. Réglade, J. A. Stevens, A. Thomas, R. Lescanne, Z. Leghtas, J. E. Cohen, E. Albertinale, P. d’Avezac, D. Banys, U. Blandin, N. Bourdaud, G. Campanaro, N. Cottet, C. Cullip, S. Deléglise, L. Devanz, A. Devulder, P. Février, A. Gicquel, J. Guillaud, E. Gümüş, M. Hallén, P. Magnard, S. Miklass, T. Peronnin, S. Polis, F. Rautschke, J. Roul, J. Solard, J.-L. Ville, P. Wan-Fat, S. Jezouin, A. Murani
| Nature Verified
Abstract Bosonic qubits implement error correction by harnessing the high-dimensional Hilbert space of a harmonic oscillator to redundantly encode logical quantum information. Squeezing of quantum states — a cornerstone of precision metrology — redistributes uncertainty between conjugate quadratures to enhance sensitivity in one variable at the expense of the other.
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Harnessing two-photon dissipation for enhanced quantum measurement and control

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By A. Marquet, Laboratoire de Physique, S. Dupouy, U. Réglade
| Physical Review B
Dissipation engineering offers a powerful tool for quantum technologies. Recently, new superconducting devices have achieved an engineered two-photon dissipation rate exceeding all other relevant timescales. In particular, they have proven most useful in preventing transitions between the logical states |±α⟩ of a cat qubit. Here, we present three key applications of strong two-photon dissipation for quantum measurement and control, beyond cat qubit stabilization.
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Autoparametric Resonance Extending the Bit-Flip Time of a Cat Qubit up to 0.3 s

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By Laboratoire de Physique, J. E. Cohen, A. Marquet, A. Essig
| Physical Review B
Popular Summary The fragility of quantum systems hinders the promise of practical quantum computing, but quantum error correction offers a promising way forward. The use of bosonic modes as quantum bits could considerably lower the number of qubits needed for such correction. One notable example is the cat qubit, based on quantum superpositions of two classical states of light.
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