Incoherent Qubit Control Using the Quantum Zeno Effect

S. Hacohen-Gourgy, L. P. García-Pintos, L. S. Martin, J. Dressel, I. Siddiqi

Research output: Contribution to journalArticlepeer-review

Abstract

The quantum Zeno effect is the suppression of Hamiltonian evolution by repeated observation, which pins the system to an eigenstate of the measurement observable. Using measurement alone, control of the state can be achieved if the observable is slowly varied, so 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 postselecting on realizations with 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.

Original languageEnglish
Article number020505
JournalPhysical Review Letters
Volume120
Issue number2
DOIs
StatePublished - 10 Jan 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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