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Demonstration of a high-fidelity, deterministic and universal squeezing transformation

Jun–ichi Yoshikawa, Toshiki Hayashi, Takayuki Akiyama, Nobuyuki Takei, Alexander Huck, Ulrik L. Andersen, Akira Furusawa

Published Feb 6, 2007• 1 citation
OpenAlex

Abstract

By employing at recent proposal (R. Filip, P. Marek and U.L. Andersen, Phys. Rev. A {\\bf 71}, 042308 (2005)), we experimentally demonstrate a high-fidelity, deterministic and universal squeezing transformation of a quantum state. The approach circumvents a direct interaction between a strong pump and the quantum state, but relies only on linear optics, homodyne detection, feedforward and an ancillary squeezed vacuum state. We demonstrate three different squeezing operations with attained fidelities of 94%, 89% and 78%.

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By employing at recent proposal (R. Filip, P. Marek and U.L. Andersen, Phys. Rev. A {\bf 71}, 042308 (2005)), we experimentally demonstrate a high-fidelity, deterministic and universal squeezing transformation of a quantum state. The approach circumvents a direct interaction between a strong pump and the quantum state, but relies only on linear optics, homodyne detection, feedforward and an ancillary squeezed vacuum state. We demonstrate three different squeezing operations with attained fidelities of 94%, 89% and 78%.
By employing a recent proposal [R. Filip, P. Marek, and U.L. Andersen, Phys. Rev. A 71, 042308 (2005)] we experimentally demonstrate a universal, deterministic, and high-fidelity squeezing transformation of an optical field. It relies only on linear optics, homodyne detection, feedforward, and an ancillary squeezed vacuum state, thus direct interaction between a strong pump and the quantum state is circumvented. We demonstrate three different squeezing levels for a coherent state input. This scheme is highly suitable for the fault-tolerant squeezing transformation in a continuous variable quantum computer.
The sum gate is the canonical two-mode gate for universal quantum computation based on continuous quantum variables. It represents the natural analogue to a qubit C-NOT gate. In addition, the continuous-variable gate describes a quantum nondemolition (QND) interaction between the quadrature components of two light modes. We experimentally demonstrate a QND sum gate, employing the scheme by R. Filip, P. Marek, and U. L. Andersen [Phys. Rev. A 71, 042308 (2005)10.1103/PhysRevA.71.042308], solely based on off-line squeezed states, homodyne measurements, and feedforward. The results are verified by simultaneously satisfying the criteria for QND measurements in both conjugate quadratures.