Engineering Schrödinger cat states with a photonic even-parity detector

G. S. Thekkadath; B. A. Bell; I. A. Walmsley; A. I. Lvovsky

doi:10.22331/q-2020-03-02-239

Engineering Schrödinger cat states with a photonic even-parity detector

G. S. Thekkadath¹, B. A. Bell¹, I. A. Walmsley¹, and A. I. Lvovsky^1,2

¹Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK
²Russian Quantum Center, 100 Novaya St., Skolkovo, Moscow 143025, Russia

Published:	2020-03-02, volume 4, page 239
Eprint:	arXiv:1908.10314v3
Doi:	https://doi.org/10.22331/q-2020-03-02-239
Citation:	Quantum 4, 239 (2020).

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Abstract

When two equal photon-number states are combined on a balanced beam splitter, both output ports of the beam splitter contain only even numbers of photons. Consider the time-reversal of this interference phenomenon: the probability that a pair of photon-number-resolving detectors at the output ports of a beam splitter both detect the same number of photons depends on the overlap between the input state of the beam splitter and a state containing only even photon numbers. Here, we propose using this even-parity detection to engineer quantum states containing only even photon-number terms. As an example, we demonstrate the ability to prepare superpositions of two coherent states with opposite amplitudes, i.e. two-component Schrödinger cat states. Our scheme can prepare cat states of arbitrary size with nearly perfect fidelity. Moreover, we investigate engineering more complex even-parity states such as four-component cat states by iteratively applying our even-parity detector.

► BibTeX data

@article{Thekkadath2020engineering,
  doi = {10.22331/q-2020-03-02-239},
  url = {https://doi.org/10.22331/q-2020-03-02-239},
  title = {Engineering {S}chr{\"{o}}dinger cat states with a photonic even-parity detector},
  author = {Thekkadath, G. S. and Bell, B. A. and Walmsley, I. A. and Lvovsky, A. I.},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {4},
  pages = {239},
  month = mar,
  year = {2020}
}

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