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Frontiers in Optics

Mastering pulsed quantum light

Christine Silberhorn, Benjamin Brecht, A. Christ, A. Eckstein

Published Jan 1, 2011• 0 citations
Publisher

Abstract

The intrinsic structure of pulsed quantum light can be exploited to introduce highly efficient multi-mode quantum information encoding for high bit rate applications. We present tools for the control and manipulation of broadband frequency modes.
DOI
10.1364/ls.2011.ltuc5

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Quantum information applications call for information encoding schemes which offer high bitrates and the possibility to encode many qubits onto one carrier. Ultrafast pulsed quantum states of light feature an inherent rich spectral and temporal broadband mode structure, which is uniquely defined by their generation process. In ultrafast parametric downconversion for instance, the pair photons are usually generated in superposition states of many orthogonal broadband modes. Thus, they carry the potential for high dimensional quantum information encoding and high bitrates. However, even though the pulsed mode structure of quantum light is well known (see e.g. [1]), feasible ways of exploiting this natural resource in practical systems have not yet been explored.
We introduce the concept of a quantum pulse gate (QPG), a method for accessing the intrinsic broadband spectral mode structure of ultrafast quantum states of light. This mode structure can now be harnessed for applications in quantum information processing. We propose an implementation in a PPLN waveguide, based on spectrally engineered sum frequency generation (SFG). It allows us to pick well-defined spectral broadband modes from an ultrafast multi-mode state for interconversion to a broadband mode at another frequency. By pulse-shaping the bright SFG pump beam, different orthogonal broadband modes can be addressed individually and extracted with high fidelity.