E. Roverc'h, A. Borgognoni, M. Villiers, K. Gerashchenko, W. C. Smith, C. Wilson, B. Douçot, A. Petrescu, P. Campagne-Ibarcq, Z. Leghtas. Experimental realization of a cos(2φ) transmon qubit. Preprint (2026). [arXiv:2603.13114]
A. Vanselow, B. Beauseigneur, L. Lattier, M. Villiers, A. Denis, P. Morfin, Z. Leghtas, P. Campagne-Ibarcq. Dissipating quartets of excitations in a superconducting circuit. Phys. Rev. X 16, 011032 (2026). [arXiv:2501.05960]
2025
M. Praquin, V. Lienhard, A. Giraudo, A. Vanselow, Z. Leghtas, P. Campagne-Ibarcq. Mixing of counterpropagating signals in a traveling-wave Josephson device. Nature Communications (2025). [arXiv:2406.19751]
R. Dhundhwal, H. Duan, L. Brauch, S. Arabi, D. Fuchs, A.-A. Haghighirad, A. Welle, F. Scharwaechter, S. Pal, M. Scheffler, J. Palomo, Z. Leghtas, A. Murani, H. Hahn, J. Aghassi-Hagmann, C. Kübel, W. Wulfhekel, I. M. Pop, T. Reisinger. High-quality superconducting tantalum resonators with beta phase defects. Applied Physics Letters 127, 214005 (2025). [arXiv:2502.17247]
R. Rousseau, D. Ruiz, E. Albertinale, P. d'Avezac, D. Banys, U. Blandin, N. Bourdaud, G. Campanaro, G. Cardoso, N. Cottet, C. Cullip, S. Deléglise, L. Devanz, A. Devulder, A. Essig, P. Février, A. Gicquel, É. Gouzien, A. Gras, J. Guillaud, E. Gümüş, M. Hallén, A. Jacob, P. Magnard, A. Marquet, S. Miklass, T. Peronnin, S. Polis, F. Rautschke, U. Réglade, J. Roul, J. Stevens, J. Solard, A. Thomas, J.-L. Ville, P. Wan-Fat, R. Lescanne, Z. Leghtas, J. Cohen, S. Jezouin, A. Murani. Enhancing dissipative cat qubit protection by squeezing. Preprint (2025). [arXiv:2502.07892]
L.-A. Sellem, A. Sarlette, Z. Leghtas, M. Mirrahimi, P. Rouchon, P. Campagne-Ibarcq. Dissipative protection of a GKP qubit in a high-impedance superconducting circuit driven by a microwave frequency comb. Physical Review X 15, 011011 (2025). [arXiv:2304.01425]
W. C. Smith, A. Borgognoni, M. Villiers, E. Roverc'h, J. Palomo, M. R. Delbecq, T. Kontos, P. Campagne-Ibarcq, B. Doucot, Z. Leghtas. Spectral signature of high-order photon processes enhanced by Cooper-pair pairing. Nature Communications 16, 8359 (2025). [arXiv:2312.15075]
K. Gerashchenko, R. Rousseau, L. Balembois, H. Patange, P. Manset, T. Briant, P.-F. Cohadon, A. Heidmann, W. C. Smith, A. Tilloy, Z. Leghtas, E. Flurin, T. Jacqmin, S. Deléglise. Probing the quantum motion of a macroscopic mechanical oscillator with a radio-frequency superconducting qubit. Preprint (2025). [arXiv:2505.21481]
2024
U. Reglade, A. Bocquet, R. Gautier, A. Marquet, E. Albertinale, N. Pankratova, M. Hallen, F. Rautschke, L.-A. Sellem, P. Rouchon, A. Sarlette, M. Mirrahimi, P. Campagne-Ibarcq, R. Lescanne, S. Jezouin, Z. Leghtas. Quantum control of a cat-qubit with bit-flip times exceeding ten seconds. Nature 629, 778–783 (2024). [arXiv:2307.06617]
D. Wilsch et al. Observation of Josephson Harmonics in Tunnel Junctions. Nature Physics 20, 815 (2024). [arXiv:2302.09192]
B.-L. Najera-Santos, R. Rousseau, K. Gerashchenko, H. Patange, A. Riva, M. Villiers, T. Briant, P.-F. Cohadon, A. Heidmann, J. Palomo, M. Rosticher, H. le Sueur, A. Sarlette, W. C. Smith, Z. Leghtas, E. Flurin, T. Jacqmin, S. Deleglise. High-sensitivity AC-charge detection with a MHz-frequency fluxonium qubit. Phys. Rev. X 14, 011007 (2024).
M. Villiers, W. C. Smith, A. Petrescu, A. Borgognoni, M. Delbecq, A. Sarlette, M. Mirrahimi, P. Campagne-Ibarcq, T. Kontos, Z. Leghtas. Dynamically enhancing qubit-photon interactions with anti-squeezing. PRX Quantum 5, 020306 (2024). [arXiv:2212.04991]
2023
C. Berdou, A. Murani, U. Reglade, W. C. Smith, M. Villiers, J. Palomo, M. Rosticher, A. Denis, P. Morfin, M. Delbecq, T. Kontos, N. Pankratova, F. Rautschke, T. Peronnin, L.-A. Sellem, P. Rouchon, A. Sarlette, M. Mirrahimi, P. Campagne-Ibarcq, S. Jezouin, R. Lescanne, Z. Leghtas. One hundred second bit-flip time in a two-photon dissipative oscillator. PRX Quantum 4, 020350 (2023). [arXiv:2204.09128]
F.-M. Le Regent, C. Berdou, Z. Leghtas, J. Guillaud, M. Mirrahimi. High-performance repetition cat code using fast noisy operations. Quantum 7, 1198 (2023). [arXiv:2212.11927]
L. C. Contamin, T. Cubaynes, W. Legrand, M. Margańska, M. Villiers, M. R. Delbecq, A. Cottet, Z. Leghtas, T. Kontos. Inhomogeneous magnetic fields interacting with spinful states in a double quantum dot: Evidence for a staggered spin-orbit interaction. Physical Review B 107, 085152 (2023).
2022
W. C. Smith, M. Villiers, A. Marquet, J. Palomo, M. R. Delbecq, T. Kontos, P. Campagne-Ibarcq, B. Doucot, Z. Leghtas. Magnifying quantum phase fluctuations with Cooper-pair pairing. Phys. Rev. X 12, 021002 (2022). [arXiv:2010.15488]
2021
Z. K. Minev, Z. Leghtas, S. O. Mundhada, L. Christakis, I. M. Pop, M. H. Devoret. Energy-participation quantization of Josephson circuits. npj Quantum Information 7, 131 (2021). [arXiv:2010.00620]
A. Essig, Q. Ficheux, T. Peronnin, N. Cottet, R. Lescanne, A. Sarlette, P. Rouchon, Z. Leghtas, B. Huard. Multiplexed photon number measurement. Physical Review X 11, 031045 (2021). [arXiv:2001.03217]
F. Valmorra, K. Yoshida, L. C. Contamin, S. Messelot, S. Massabeau, M. R. Delbecq, M. C. Dartiailh, M. M. Desjardins, T. Cubaynes, Z. Leghtas, K. Hirakawa, J. Tignon, S. Dhillon, S. Balibar, J. Mangeney, A. Cottet, T. Kontos. Vacuum-field-induced THz transport gap in a carbon nanotube quantum dot. Nature Communications 12 (2021).
2020
R. Lescanne, M. Villiers, T. Peronnin, A. Sarlette, M. Delbecq, B. Huard, T. Kontos, M. Mirrahimi, Z. Leghtas. Exponential suppression of bit-flips in a qubit encoded in an oscillator. Nature Physics 16, 509–513 (2020). [arXiv:1907.11729]
R. Lescanne, S. Deleglise, E. Albertinale, U. Reglade, T. Capelle, E. Ivanov, T. Jacqmin, Z. Leghtas, E. Flurin. Irreversible Qubit-Photon Coupling for the Detection of Itinerant Microwave Photons. Phys. Rev. X 10, 021038 (2020). [arXiv:1902.05102]
A. Cottet, Z. Leghtas, T. Kontos. Theory of interactions between cavity photons induced by a mesoscopic circuit. Phys. Rev. B 102, 155105 (2020). [arXiv:1910.07801]
2019
T. Cubaynes, M. R. Delbecq, M. C. Dartiailh, R. Assouly, M. M. Desjardins, L. C. Contamin, L. E. Bruhat, Z. Leghtas, F. Mallet, A. Cottet, T. Kontos. Highly coherent spin states in carbon nanotubes coupled to cavity photons. NPJ Quantum Information 5, 47 (2019). [arXiv:1903.05229]
L. Verney, R. Lescanne, M. H. Devoret, Z. Leghtas, M. Mirrahimi. Structural instability of driven Josephson circuits prevented by an inductive shunt. Phys. Rev. Applied 11, 024003 (2019). [arXiv:1805.07542]
R. Lescanne, L. Verney, Q. Ficheux, M. H. Devoret, B. Huard, M. Mirrahimi, Z. Leghtas. Observing the escape of a driven quantum Josephson circuit into unconfined states. Phys. Rev. Applied 11, 014030 (2019). [arXiv:1805.05198]
2018
S. Touzard, A. Grimm, Z. Leghtas, S. O. Mundhada, P. Reinhold, R. Heeres, C. Axline, M. Reagor, K. Chou, J. Blumoff, K. M. Sliwa, S. Shankar, L. Frunzio, R. J. Schoelkopf, M. Mirrahimi, M. H. Devoret. Coherent oscillations inside a quantum manifold stabilized by dissipation. Phys. Rev. X 8, 021005 (2018). [arXiv:1705.02401]
Q. Ficheux, S. Jezouin, Z. Leghtas, B. Huard. Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing. Nature Communications 9, 1926 (2018). [arXiv:1711.01208]
D. Markovic, S. Jezouin, Q. Ficheux, S. Fedortchenko, S. Felicetti, T. Coudreau, P. Milman, Z. Leghtas, B. Huard. Demonstration of an effective ultrastrong coupling between two oscillators. Phys. Rev. Lett. 121, 040505 (2018). [arXiv:1804.08705]
E. Zalys-Geller, A. Narla, S. Shankar, M. Hatridge, M. P. Silveri, K. Sliwa, Z. Leghtas, M. H. Devoret. Generation of discord through a remote joint continuous variable measurement. Preprint (2018). [arXiv:1803.01275]
2016
N. Ofek, A. Petrenko, R. Heeres, P. Reinhold, Z. Leghtas, B. Vlastakis, Y. Liu, L. Frunzio, S. M. Girvin, L. Jiang, M. Mirrahimi, M. H. Devoret, R. J. Schoelkopf. Extending the lifetime of a quantum bit with error correction in superconducting circuits. Nature 536, 441–445 (2016). [arXiv:1602.04768]
A. Narla, S. Shankar, M. Hatridge, Z. Leghtas, K. M. Sliwa, E. Zalys-Geller, S. O. Mundhada, W. Pfaff, L. Frunzio, R. J. Schoelkopf, M. H. Devoret. Robust concurrent remote entanglement between two superconducting qubits. Phys. Rev. X 6, 031036 (2016). [arXiv:1603.03742]
M. Silveri, E. Zalys-Geller, M. Hatridge, Z. Leghtas, M. H. Devoret, S. M. Girvin. Theory of remote entanglement via quantum-limited phase-preserving amplification. Phys. Rev. A 93, 062310 (2016). [arXiv:1507.00732]
Z. K. Minev, K. Serniak, I. M. Pop, Z. Leghtas, K. Sliwa, M. Hatridge, L. Frunzio, R. J. Schoelkopf, M. H. Devoret. Planar multilayer circuit quantum electrodynamics. Phys. Rev. Applied 5, 044021 (2016). [arXiv:1509.01619]
2015
Z. Leghtas, S. Touzard, I. M. Pop, A. Kou, B. Vlastakis, A. Petrenko, K. M. Sliwa, A. Narla, S. Shankar, M. J. Hatridge, M. Reagor, L. Frunzio, R. J. Schoelkopf, M. Mirrahimi, M. H. Devoret. Confining the state of light to a quantum manifold by engineered two-photon loss. Science 347, 853–857 (2015). [arXiv:1412.4633]
B. Vlastakis, A. Petrenko, N. Ofek, L. Sun, Z. Leghtas, K. Sliwa, Y. Liu, M. Hatridge, J. Blumoff, L. Frunzio, M. Mirrahimi, L. Jiang, M. H. Devoret, R. J. Schoelkopf. Characterizing entanglement of an artificial atom and a cavity cat state with Bell's inequality. Nature Communications 6, 8970 (2015). [arXiv:1504.02512]
E. T. Holland, B. Vlastakis, R. W. Heeres, M. J. Reagor, U. Vool, Z. Leghtas, L. Frunzio, G. Kirchmair, M. H. Devoret, M. Mirrahimi, R. J. Schoelkopf. Single-Photon-Resolved Cross-Kerr Interaction for Autonomous Stabilization of Photon-Number States. Phys. Rev. Lett. 115, 180501 (2015). [arXiv:1504.03382]
A. Roy, Z. Leghtas, A. D. Stone, M. Devoret, M. Mirrahimi. Continuous generation and stabilization of mesoscopic field superposition states in a quantum circuit. Physical Review A 91, 013810 (2015).
2014
L. Sun, A. Petrenko, Z. Leghtas, B. Vlastakis, G. Kirchmair, K. M. Sliwa, A. Narla, M. Hatridge, S. Shankar, J. Blumoff, L. Frunzio, M. Mirrahimi, M. H. Devoret, R. J. Schoelkopf. Tracking photon jumps with repeated quantum non-demolition parity measurements. Nature 511, 444 (2014). [arXiv:1311.2534]
M. Mirrahimi, Z. Leghtas, V. V. Albert, S. Touzard, R. J. Schoelkopf, L. Jiang, M. H. Devoret. Dynamically protected cat-qubits: a new paradigm for universal quantum computation. New Journal of Physics 16, 045014 (2014). [arXiv:1312.2017]
2013
G. Kirchmair, B. Vlastakis, Z. Leghtas, S. E. Nigg, H. Paik, E. Ginossar, M. Mirrahimi, L. Frunzio, S. M. Girvin, R. J. Schoelkopf. Observation of quantum state collapse and revival due to the single-photon Kerr effect. Nature 495, 205–209 (2013). [arXiv:1211.2228]
S. Shankar, M. Hatridge, Z. Leghtas, K. M. Sliwa, A. Narla, U. Vool, S. M. Girvin, L. Frunzio, M. Mirrahimi, M. H. Devoret. Autonomously stabilized entanglement between two superconducting quantum bits. Nature 504 (2013). [arXiv:1307.4349]
B. Vlastakis, G. Kirchmair, Z. Leghtas, S. E. Nigg, L. Frunzio, S. M. Girvin, M. Mirrahimi, M. H. Devoret, R. J. Schoelkopf. Deterministically encoding quantum information using 100-photon Schrödinger cat states. Science 342, 607–610 (2013).
Z. Leghtas, G. Kirchmair, B. Vlastakis, R. J. Schoelkopf, M. H. Devoret, M. Mirrahimi. Hardware-efficient autonomous quantum memory protection. Physical Review Letters 111, 120501 (2013).
Z. Leghtas, U. Vool, S. Shankar, M. Hatridge, S. M. Girvin, M. H. Devoret, M. Mirrahimi. Stabilizing a Bell state of two superconducting qubits by dissipation engineering. Physical Review A 88, 023849 (2013).
Z. Leghtas, G. Kirchmair, B. Vlastakis, M. H. Devoret, R. J. Schoelkopf, M. Mirrahimi. Deterministic protocol for mapping a qubit to coherent state superpositions in a cavity. Physical Review A 87, 042315 (2013).
K. Geerlings, Z. Leghtas, I. M. Pop, S. Shankar, L. Frunzio, R. J. Schoelkopf, M. Mirrahimi, M. H. Devoret. Demonstrating a driven reset protocol for a superconducting qubit. Physical Review Letters 110, 120501 (2013). [arXiv:1211.0491]
R. Rey-de Castro, Z. Leghtas, H. Rabitz. Manipulating quantum pathways on the fly. Physical Review Letters 110, 223601 (2013).
2012
A. Sarlette, Z. Leghtas, M. Brune, J. M. Raimond, P. Rouchon. Stabilization of nonclassical states of one- and two-mode radiation fields by reservoir engineering. Physical Review A 86, 012114 (2012). [arXiv:1203.0929]
Z. Leghtas, G. Turinici, H. Rabitz, P. Rouchon. Hamiltonian identification through enhanced observability utilizing quantum control. IEEE Transactions on Automatic Control 57, 2679–2683 (2012).
O. M. Shir, J. Roslund, Z. Leghtas, H. Rabitz. Quantum control experiments as a testbed for evolutionary multi-objective algorithms. Genetic Programming and Evolvable Machines 13, 445–491 (2012).
2011
Z. Leghtas, A. Sarlette, P. Rouchon. Adiabatic passage and ensemble control of quantum systems. Journal of Physics B 44, 154017 (2011).
Z. Leghtas, M. Mirrahimi, P. Rouchon. Back and forth nudging for quantum state estimation by continuous weak measurement. American Control Conference (2011).
Z. Leghtas, M. Mirrahimi, P. Rouchon. Parameter estimation of a 3-level quantum system with a single population measurement. IEEE Conference on Decision and Control (2009).
