2017/03/09 by Wei Wang, W. Wang, Lian Hu +14 · 52 citations
Computer Science · Mathematics · Physics and Astronomy · #Algorithm #Charge qubit #Cluster state #Coherent states #Eigenvalues and eigenvectors #Flux qubit #Fock space #Fock state #Mathematics #Microwave #Microwave cavity #Phase qubit #Photon #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #Quantum state #Qubit #State (computer science) #Superconducting quantum computing #Superposition principle #Transmon #quant-ph
paper · pdf · doi:10.1103/physrevlett.118.223604
published in Physical Review Letters 118(22), 223604 (American Physical Society) · 3 figures and 2 tables in the main, 5 figures and 1 table in the supplement
arxiv created 2017/03/09 · openalex publication_date 2017/06/01 · arxiv updated 2017/06/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We propose and experimentally demonstrate a new method to generate arbitrary Fock state superpositions in a superconducting quantum circuit, where a qubit is dispersively coupled to a microwave cavity mode. Here, the qubit is used to conditionally modulate the probability amplitudes of the Fock state components of a coherent state to those of the desired superposition state, instead of pumping photons one by one into the cavity as in previous schemes. Our method does not require the adjustment of the qubit frequency during the cavity state preparation and is more robust to noise and accumulation of experimental errors compared to previous ones. Using the method, we experimentally generate phase eigenstates under various Hilbert-space dimensions and squeezed states, which are useful for the quantum walk and high-precision measurement.