Deterministic amplification of Schrödinger 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 gre...

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Bibliographic Details
Published in:New journal of physics 2016-02, Vol.18 (2), p.23028
Main Authors: Joo, Jaewoo, Elliott, Matthew, Oi, Daniel K L, Ginossar, Eran, Spiller, Timothy P
Format: Article
Language:English
Subjects:
Accuracy
Amplification
amplification of quantum states
Atomic states
cat states
Circuit design
circuit quantum electrodynamics
Computer simulation
Continuity (mathematics)
Data processing
Information processing
Photonics
Physics
Quantum electrodynamics
Quantum mechanics
quantum optics
Quantum phenomena
Schroedinger cat state
superconducting circuits
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Summary: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.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/18/2/023028