The quartic Blochnium: an anharmonic quasicharge superconducting qubit

• URL: http://arxiv.org/abs/2304.10401v2
• Date: Thu, 30 Nov 2023 10:28:25 GMT
• Title: The quartic Blochnium: an anharmonic quasicharge superconducting qubit
• Authors: Luca Chirolli, Matteo Carrega, Francesco Giazotto
• Abstract summary: We propose a novel design that employs a quartic superinductor and confers a good degree of anharmonicity to the spectrum. The quartic regime is achieved through a properly designed chain of Josephson junction loops that shows minimal quantum fluctuations.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The quasicharge superconducting qubit realizes the dual of the transmon and shows strong robustness to flux and charge fluctuations thanks to a very large inductance closed on a Josephson junction. At the same time, a weak anharmonicity of the spectrum is inherited from the parent transmon, that introduces leakage errors and is prone to frequency crowding in multi-qubit setups. We propose a novel design that employs a quartic superinductor and confers a good degree of anharmonicity to the spectrum. The quartic regime is achieved through a properly designed chain of Josephson junction loops that shows minimal quantum fluctuations without introducing a severe dependence on the external fluxes.

Related papers

• Complementing the transmon by integrating a geometric shunt inductor [0.0]
  We show that the ZZ interaction between the two qubits is completely suppressed when they are flux-biased to have opposite-sign anharmonicities. The simplicity of this two-qubit-species circuit makes it promising for building large lattices of superconducting qubits with low coherent error and a rich gate set.
  arXiv  Detail & Related papers  (2024-10-14T12:06:57Z)
• Tunneling of fluxons via a Josephson resonant level [0.0]
  A superconducting loop can be coherently coupled by quantum phase slips occurring at a weak link such as a Josephson junction. We analyze this scenario by computing the coupling between fluxons as the level is brought into resonance with the superconducting condensate. These findings can inform experiments on bifluxon qubits as well as the design of novel types of protected qubits.
  arXiv  Detail & Related papers  (2023-10-04T18:33:30Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• Resolving Fock states near the Kerr-free point of a superconducting resonator [51.03394077656548]
  We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Asymmetric Inductive eLement) We have excited photons near this Kerr-free point and characterized the device using a transmon qubit.
  arXiv  Detail & Related papers  (2022-10-18T09:55:58Z)
• Reminiscence of classical chaos in driven transmons [117.851325578242]
  We show that even off-resonant drives can cause strong modifications to the structure of the transmon spectrum rendering a large part of it chaotic. Results lead to a photon number threshold characterizing the appearance of chaos-induced quantum demolition effects.
  arXiv  Detail & Related papers  (2022-07-19T16:04:46Z)
• Stabilizing and improving qubit coherence by engineering noise spectrum of two-level systems [52.77024349608834]
  Superconducting circuits are a leading platform for quantum computing. Charge fluctuators inside amorphous oxide layers contribute to both low-frequency $1/f$ charge noise and high-frequency dielectric loss. We propose to mitigate those harmful effects by engineering the relevant TLS noise spectral densities.
  arXiv  Detail & Related papers  (2022-06-21T18:37:38Z)
• A superconducting qubit with noise-insensitive plasmon levels and decay-protected fluxon states [0.0]
  inductively shunted transmon (IST) is a superconducting qubit with exponentially suppressed fluxon transitions and a plasmon spectrum approximating that of the transmon. We realize IST qubits deep in the transmon limit where the large geometric inductance acts as a mere perturbation.
  arXiv  Detail & Related papers  (2022-02-28T16:11:55Z)
• Optimization of the resonator-induced phase gate for superconducting qubits [0.0]
  We study the physics of weakly anharmonic transmon qubits coupled to linear resonators. We show this type of leakage can be substantially suppressed using very weakly anharmonic transmons.
  arXiv  Detail & Related papers  (2021-10-04T21:27:02Z)
• Superconducting coupler with exponentially large on-off ratio [68.8204255655161]
  Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. Most couplers operate in a narrow frequency band and target specific couplings, such as the spurious $ZZ$ interaction. We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on-off ratio.
  arXiv  Detail & Related papers  (2021-07-21T03:03:13Z)
• Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction [0.0]
  We present a large variety of qubits all stemming from the same circuit but with drastically different characteristic energy scales. The use of a geometric inductor results in high precision of the inductive and capacitive energy as guaranteed by top-down lithography.
  arXiv  Detail & Related papers  (2021-06-10T16:09:36Z)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.