Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K75: Superconducting Qubits: Cat Qubits and Strong Coupling
3:00 PM–5:36 PM,
Tuesday, March 7, 2023
Room: Room 401/402
Sponsoring
Unit:
DQI
Chair: Chen Wang, University of Massachusetts Amherst
Abstract: K75.00005 : Adiabatic Fock state generation and faithful Wigner tomography in a Kerr nonlinear resonator*
4:12 PM–4:24 PM
Presenter:
Shiori Fujii
(Tokyo University of Science)
Authors:
Shiori Fujii
(Tokyo University of Science)
Daisuke Iyama
(Tokyo University of Science)
Takahiko Kamiya
(Tokyo University of Science)
Sangil Kwon
(Tokyo University of Science)
Shohei Watabe
(Shibaura Institute of Technology)
Jiao-Jiao Xue
(RIKEN Center for Quantum Computing (RQC))
Jaw-Shen Tsai
(RIKEN Center for Quantum Computing (RQC))
Here, we present implementation of adiabatic Fock state generation using Kerr nonlinearity. We adiabatically vary the detuning and the strength of the resonator driving field to let the state evolve from the vacuum state to the target Fock state [1].
The fidelity of our Fock state is obtained by Wigner tomography. For this we employ parity measurement and quantum state tomography with neural network algorithm, conditional generative adversarial network (QST-CGAN) [2]. The technical difficulty of this process is unwanted Kerr evolution during the parity measurement. We solve this problem by using ultrafast pulse control and post-processing. QST-CGAN constructs the density matrix from our parity measurement and finally gives us the state fidelity.
[1] R. Yanagimoto et al., Adiabatic Fock-state-generation scheme using Kerr nonlinearity, Phy. Rev. A 100, 033822 (2019)
[2] S. Ahmed et al., Quantum State Tomography with Conditional Generative Adversarial Networks, Phy. Rev. Lett. 127, 140502 (2021)
*This work was supported by JST [Moonshot R&D][Grant NumberJPMJMS2067] and the results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).
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