期刊
PRX QUANTUM
卷 1, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PRXQuantum.1.010305
关键词
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资金
- U.S. Army Research Office Grant [W911NF-14-1-0682]
- Department of Defense via MIT Lincoln Laboratory under Air Force [FA8721-05-C0002]
- National Science Foundation [PHY-1720311]
- Fonds de Recherche du Quebec Nature et Technologies
Noise that exhibits significant temporal and spatial correlations across multiple qubits can be especially harmful to both fault-tolerant quantum computation and quantum-enhanced metrology. However, a complete spectral characterization of the noise environment of even a two-qubit system has not been reported thus far. We propose and experimentally demonstrate a protocol for two-qubit dephasing noise spectroscopy based on continuous-control modulation. By combining ideas from spin-locking relaxometry with a statistically motivated robust estimation approach, our protocol allows for the simultaneous reconstruction of all the single-qubit and two-qubit cross-correlation spectra, including access to their distinctive nonclassical features. Only single-qubit control manipulations and state-tomography measurements are employed, with no need for entangled-state preparation or readout of two-qubit observables. While our experimental demonstration uses two superconducting qubits coupled to a shared, colored engineered noise source, our methodology is portable to a variety of dephasing-dominated qubit architectures. By pushing quantum noise spectroscopy beyond the single-qubit setting, our work heralds the characterization of spatiotemporal correlations in both engineered and naturally occurring noise environments.
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