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Trapped Ion Quantum Computing

Quantum state tomography of undetected photons

arXiv
Authors: Jorge Fuenzalida, Jaroslav Kysela, Krishna Dovzhik, Gabriela Barreto Lemos, Armin Hochrainer, Mayukh Lahiri, Anton Zeilinger

Year

2022

Paper ID

6703

Status

Preprint

Abstract Read

~2 min

Abstract Words

98

Citations

N/A

Abstract

The measurement of quantum states is one of the most important problems in quantum mechanics. We introduce a quantum state tomography technique in which the state of a qubit is reconstructed, while the qubit remains undetected. The key ingredients are: (i) employing an additional qubit, (ii) aligning the undetected qubit with a known reference state by using path identity, and (iii) measuring the additional qubit to reconstruct the undetected qubit state. We theoretically establish and experimentally demonstrate the method with photonic polarization states. The principle underlying our method could also be applied to quantum entities other than photons.

Why This Paper Matters

  • This paper contributes to the Trapped-Ion Quantum Computing research area in the Quantum Articles archive.
  • It adds a 2022 reference point for readers tracking recent quantum research.
  • The measurement of quantum states is one of the most important problems in quantum mechanics.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2211.10304 [2] arXiv https://arxiv.org/abs/2211.10304 [3] Publisher https://arxiv.org/abs/2211.10304

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