Heralded creation of photonic qudits from parametric down conversion using linear optics
| Autor: | Marcel Bergmann, Masanori Okada, Shuntaro Takeda, Takeshi Toyama, Kenzo Makino, Maria Fuwa, Peter van Loock, Kan Takase, Akira Furusawa, Jun-ichi Yoshikawa |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Quantum Physics Photon business.industry FOS: Physical sciences 01 natural sciences 010309 optics Superposition principle Optics Spontaneous parametric down-conversion Quantum error correction Quantum mechanics Qubit 0103 physical sciences Qutrit 010306 general physics business Quantum Physics (quant-ph) Quantum Squeezed coherent state |
| DOI: | 10.48550/arxiv.1710.08906 |
| Popis: | We propose an experimental scheme to generate, in a heralded fashion, arbitrary quantum superpositions of two-mode optical states with a fixed total photon number $n$ based on weakly squeezed two-mode squeezed state resources (obtained via weak parametric down conversion), linear optics, and photon detection. Arbitrary $d$-level (qudit) states can be created this way where $d=n+1$. Furthermore, we experimentally demonstrate our scheme for $n=2$. The resulting qutrit states are characterized via optical homodyne tomography. We also discuss possible extensions to more than two modes concluding that, in general, our approach ceases to work in this case. For illustration and with regards to possible applications, we explicitly calculate a few examples such as NOON states and logical qubit states for quantum error correction. In particular, our approach enables one to construct bosonic qubit error-correction codes against amplitude damping (photon loss) with a typical suppression of $\sqrt{n}-1$ losses and spanned by two logical codewords that each correspond to an $n$-photon superposition for two bosonic modes. Comment: 11 pages, 8 figures |
| Databáze: | OpenAIRE |
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