Abstract
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.
| Original language | English |
|---|---|
| Article number | 023028 |
| Pages (from-to) | 1-11 |
| Number of pages | 11 |
| Journal | New Journal of Physics |
| Volume | 18 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 5 Feb 2016 |
Keywords
- amplification of quantum states
- cat states
- circuit quantum electrodynamics
- quantum optics
- superconducting circuits