Coherent Non-Local Subspace Dynamics Induced by Zeno Measurements
ORAL
Abstract
We describe how an entangling operation related to a CPHASE gate may be implemented by drawing on unique features of quantum measurement. The dynamics of a quantum system can be frozen by sufficiently strong monitoring, i.e., by the quantum Zeno effect. We show here that it is possible to combine local unitary operations and Zeno blocking of a single transition within a larger quantum system, in such a way that an effective non-local quantum operation is performed in an unmonitored subspace. We illustrate ideal realizations of such a process in detail, and then further describe the conditions under which it may be implemented using the dispersive continuous monitoring techniques commonly used in superconducting qubit systems. The scheme is experimentally feasible, and an implementation of it will be described in the talk by E. Blumenthal et al.
*This work was supported by Laboratory Directed Research and Development (LDRD) funding from Lawrence Berkeley National Laboratory, provided by the U.S. Department of Energy, Office of Science under Contract No. DE-AC02-05CH11231, and the National Quantum Information Science Research Centers, Quantum Systems Accelerator. LM was supported by the National Science Foundation Graduate Fellowship Grant No. (1106400) and the Berkeley Fellowship for Graduate Study. EB and SHG acknowledge support from ISF grant No. 1113/19, US-Israel BSF grant No. 2020166, and Technion's Helen Diller Quantum Center. DB acknowledges support by the Berkeley Center for Quantum Information, and the ARC (project numbers FT190100106, DP210101367, CE170100009).
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Publication:Experimental paper appears at https://arxiv.org/abs/2108.08549; a corresponding theory work is in preparation.
Presenters
Philippe Lewalle
University of California, Berkeley
Authors
Philippe Lewalle
University of California, Berkeley
Leigh S Martin
Harvard University
Emmanuel Flurin
Quantronics Group, SPEC, CEA Saclay, Paris, France
