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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Quantum computation with harmonic oscillators

Stephen D. Bartlett, Barry C. Sanders, Hubert de Guise

Published Nov 13, 2002• 0 citations
Publisher

Abstract

We introduce a new realization of continuous-variable quantum computation using number and phase operators. A proposed physical realization is given in terms of microwave cavities, coupled via a standard Kerr optical nonlinearity.
DOI
10.1109/cleopr.2001.971005

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The rich dynamics and large Hilbert space of quantum harmonic oscillators make them natural candidates for hardware-efficient and error-correctable quantum information processing. However, implementing direct entangling operations between oscillators remains an outstanding challenge. Existing strategies typically rely on parametrically activating interactions that populate the excited states of a nonlinear element, which introduces additional dissipation channels and potential leakage from the encoded manifold. Here, we engineer a Raman-assisted cross-Kerr interaction between microwave photons hosted in two superconducting cavities. Crucially, this dynamics does not excite the mediating nonlinear coupler, thereby suppressing coupler induced decoherence and leakage out of the bosonic code space. We use this direct nonlinear coupling to implement a controlled-phase gate within the single- and two-photon subspaces of two oscillators, deterministically generating entanglement between them. Finally, we use these engineered dynamics to implement a photon-number parity check on a storage cavity via purely bosonic interactions with an ancillary cavity, demonstrating an enhancement in the storage lifetime. Our work provides a promising pathway toward engineering robust operations that act entirely within a protected bosonic code space and realizing fault-tolerant quantum information processing with bosonic elements.