Quantum superposition of distinct macroscopic states

By J. Friedman, V. Patel, W. Chen, S. K. Tolpygo, J. Lukens. Nature, 2000

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Atomic physics and quantum optics using superconducting circuits (2011, background): “, one [89] or four junctions [90], can be used for a flux qubit.”
Decoherence and the transition from quantum to classical -- REVISITED (2003, neutral): “The alternative is to regard the state vector as an ontological entity—as a solid description of the state of the Universe akin to the classical states.”
Microwave photonics with superconducting quantum circuits (2017, background): “For a flux-qubit circuit with a single-junction loop [34, 37], a large self-inductance is needed to obtain enough quantum states in the local minimum of the circuit’s potential energy.”
Stimulated Raman adiabatic passage in physics, chemistry, and beyond (2016, background): “, 1999), flux (Friedman et al., 2000; van der Wal et al., 2000), and phase (Martinis et al.”
1 / f noise: Implications for solid-state quantum information (2013, background): “Such a superposition has been demonstrated by Friedman et al. (2000) and Van der Wal et al. (2000).”
Circuit quantum electrodynamics (2010, background): “There are various schemes for incorporating a junction, leading to what are known as phase qubits [14], flux qubits [15, 16] and charge qubits [17, 18].”