Incoherent qubit control using the quantum Zeno effect

Abstract

The quantum Zeno effect is the suppression of Hamiltonian evolution by repeated observation, resulting in the pinning of the state to an eigenstate of the measurement observable. Using measurement only, control of the state can be achieved if the observable is slowly varied such that the state tracks the now time-dependent eigenstate. We demonstrate this using a circuit-QED readout technique that couples to a dynamically controllable observable of a qubit. Continuous monitoring of the measurement record allows us to detect an escape from the eigenstate, thus serving as a built-in form of error detection. We show this by post-selecting on realizations with arbitrarily high fidelity with respect to the target state. Our dynamical measurement operator technique offers a new tool for numerous forms of quantum feedback protocols, including adaptive measurements and rapid state purification.

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• Trajectory tracking for non-Markovian quantum systems
• Optimal Zeno Dragging for Quantum Control: A Shortcut to Zeno with Action-based Scheduling Optimization
• Stabilizing two-qubit entanglement with dynamically decoupled active feedback
• Possibility of detecting gravity of an object frozen in a spatial superposition by the Zeno effect
• Control landscape of measurement-assisted transition probability for a three-level quantum system with dynamical symmetry
• Decoherence-assisted quantum driving
• Motion from Measurement: The Role of Symmetry of Quantum Measurements
• Eluding Zeno effect via dephasing and detuning
• CDJ-Pontryagin Optimal Control for General Continuously Monitored Quantum Systems
• Observation of the Quantum Zeno Effect on a NISQ Device
• Quantum state driving: measurements versus pulses
• Quantum feedback for measurement and control