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QI: Fachverband Quanteninformation

QI 29: Quantum Information: Concepts and Methods I

QI 29.6: Vortrag

Donnerstag, 13. März 2025, 12:30–12:45, HS IV

Towards constructing a parity interferometer — •Freyja Ullinger, Kaisa Laiho, and Matthias Zimmermann — German Aerospace Center (DLR), Institute of Quantum Technologies, 89081 Ulm, Germany

In continuous-variable quantum information [1], it is important to characterize quantum states in order to verify the quality of the preparation and to test the output of protocols [2]. For this purpose, we apply the quantum-mechanical parity operator which enables the reconstruction of the phase-space representation of a quantum state [3,4]. However, the implementation of a parity measurement is a subtle issue as many existing schemes are restricted to the particular sets of states to be probed.

In this talk, we present a scheme for parity measurements independent of the physical quantum system. In particular, we reveal the key components necessary for the construction of a parity interferometer. The output of our device measures the parity of a general initial state. We further exploit possible implementations and discuss limitations in such experimental arrangements.

[1] A. L. Braunstein und A. K. Pati, Quantum Information with Continuous Variables (Kluwer Academic Publishers, Dordrecht, 2001).

[2] A. I. Lvovsky and M. G. Raymer, Rev. Mod. Phys. 81, 299 (2009).

[3] A. Royer, Phys. Rev. A 15, 449 (1977).

[4] F. Ullinger, ’Interference effects in quadratic potentials’, Master’s thesis (Ulm University, Ulm, 2022).

Keywords: Parity measurement; Quantum state tomography; Quantum information