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Two-qubit spectroscopy of spatiotemporally correlated quantum noise in superconducting qubits
Uwe von Lüpke, Félix Beaudoin, Leigh M. Norris +9
Noise that exhibits significant temporal and spatial correlations across multiple qubits can be especially harmful to both fault-tolerant quantum computation and quantum-enhanced m…
Simultaneous spectral estimation of dephasing and amplitude noise on a qubit sensor via optimally band-limited control
Virginia Frey, Leigh M. Norris, Lorenza Viola +1
The fragility of quantum systems makes them ideally suited for sensing applications at the nanoscale. However, interpreting the output signal of a qubit-based sensor is generally c…
Extending comb-based spectral estimation to multiaxis quantum noise
Gerardo A. Paz-Silva, Leigh M. Norris, Félix Beaudoin +1
We show how to achieve full spectral characterization of general multiaxis additive noise. Our pulsed spectral estimation technique is based on sequence repetition and frequency-co…
Non-Gaussian noise spectroscopy with a superconducting qubit sensor
Youngkyu Sung, Félix Beaudoin, Leigh M. Norris +9
Accurate characterization of the noise influencing a quantum system of interest has far-reaching implications across quantum science, ranging from microscopic modeling of decoheren…
Uniquely determined pure quantum states need not be unique ground states of quasi-local Hamiltonians
Salini Karuvade, Peter D. Johnson, Francesco Ticozzi +1
We consider the problem of characterizing states of a multipartite quantum system from restricted, quasi-local information, with emphasis on uniquely determined pure states. By lev…