We propose a dynamical scheme for deterministically amplifying photonic
Schroedinger cat states based on a set of optimal state-transfers. The scheme
can be implemented in strongly coupled qubit-cavity systems and is well suited
to the capabilities of state of the art superconducting circuits. The ideal
analytical scheme is compared with a full simulation of the open
Jaynes-Cummings model with realistic device parameters. This amplification tool
can be utilized for practical quantum information processing in non-classical
continuous-variable states.Comment: A revised manuscript has 6 figure

Elliott, Matthew

Ginossar, Eran

Joo, Jaewoo

Oi, Daniel K. L.

Spiller, Timothy P.

New Journal of Physics

English

arXiv

We propose a dynamical scheme for deterministically amplifying photonic Schr$\"o$dinger cat states based on a set of optimal state-transfers. The scheme can be implemented in strongly coupled qubit-cavity systems and is well suited to the capabilities of state of the art superconducting circuits. The ideal analytical scheme is compared with a full simulation of the open Jaynes-Cummings model with realistic device parameters. This amplification tool can be utilized for practical quantum information processing in non-classical continuous-variable states

Joo, J

Elliott, M

Oi, DKL

Ginossar, E

Spiller, TP

Surrey Research Insight

Deterministic amplification of Schr$ö$dinger cat states in circuit quantum electrodynamics

Perfect deterministic amplification of arbitrary quantum states is prohibited by quantum mechanics, but determinism can be achieved by compromising between fidelity and amplification power. We propose a dynamical scheme for deterministically amplifying photonic Schrödinger cat states, which show great promise as a tool for quantum information processing. Our protocol is designed for strongly coupled circuit quantum electrodynamics and utilizes artificial atomic states and external microwave controls to engineer a set of optimal state transfers and achieve high fidelity amplification. We compare analytical results with full simulations of the open, driven Jaynes-Cummings model, using realistic device parameters for state of the art superconducting circuits. Amplification with a fidelity of 0.9 can be achieved for sizable cat states in the presence of cavity and atomic-level decoherence. This tool could be applied to practical continuous-variable information processing for the purification and stabilization of cat states in the presence of photon losses

Oi, Daniel K L

University of Strathclyde Institutional Repository

Deterministic amplification of Schrödinger cat states in circuit quantum electrodynamics

Deterministic amplification of Schroedinger cat states in circuit
  quantum electrodynamics

Deterministic amplification of Schroedinger cat states in circuit quantum electrodynamics

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Surrey Research Insight

University of Strathclyde Institutional Repository