High-order multiphoton interaction using voltage biased Josephson junction
ORAL
Abstract
Multiphoton interactions are a key ingredient in many superconducting quantum devices such as parametric amplifiers, photon detection or Qbit stabilisation. They are enabled by non-linear elements (usually a Josephson junction) driven by parametric pumps. However, in addition to the wanted interaction term, the non-linearity usually produces other unwanted terms, limiting the usable interactions to 3- or 4-wave mixing terms.
In this talk, I will showcase the use of our microwave photon number multiplier [1] as a multi-photon frequency converter, enabling mixing terms of much higher order while limiting spurious terms. This voltage-biased Josephson junctions device, which we have already explored as a photomultiplier (converting 1 to N photons), only relies on a DC voltage bias. By simply changing this bias, one can use it as a multi-photon converter, i.e. coupling M photons at the input to N photons at the output at a different frequency. We have observed conversion up to M+N=8, and we are in the process of reducing the inherent phase noise from the DC bias using injection-locking.
This scheme enables strong multiphoton interactions and could be used, for example, as a multi-photon loss channel for implementing bosonic codes [2].
[1]: R. Albert, et al. "Microwave photon-number amplification." Physical Review X 14.1 (2024): 011011.
[2]: T. Aissaoui, et al. "A cat qubit stabilization scheme using a voltage biased Josephson junction." arXiv:2411.08132 (2024).
In this talk, I will showcase the use of our microwave photon number multiplier [1] as a multi-photon frequency converter, enabling mixing terms of much higher order while limiting spurious terms. This voltage-biased Josephson junctions device, which we have already explored as a photomultiplier (converting 1 to N photons), only relies on a DC voltage bias. By simply changing this bias, one can use it as a multi-photon converter, i.e. coupling M photons at the input to N photons at the output at a different frequency. We have observed conversion up to M+N=8, and we are in the process of reducing the inherent phase noise from the DC bias using injection-locking.
This scheme enables strong multiphoton interactions and could be used, for example, as a multi-photon loss channel for implementing bosonic codes [2].
[1]: R. Albert, et al. "Microwave photon-number amplification." Physical Review X 14.1 (2024): 011011.
[2]: T. Aissaoui, et al. "A cat qubit stabilization scheme using a voltage biased Josephson junction." arXiv:2411.08132 (2024).
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Presenters
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nicolas bourlet
- Université de Sherbrooke