Characterization of conditional state-engineering quantum processes by coherent state quantum process tomography

TL;DR

This paper experimentally characterizes a conditional quantum optical process called Fock-state filtration using coherent state quantum process tomography, identifying key imperfections and demonstrating its nonlinear photon-number response and phase preservation capabilities.

Contribution

It provides the first detailed experimental characterization of Fock-state filtration, highlighting main sources of imperfection and assessing its potential for quantum information applications.

Findings

Achieved high-fidelity process reconstruction with fidelity > 0.95.

Identified three main experimental challenges: single-photon source quality, mode overlap, and photon-number resolving detection.

Demonstrated the nonlinear and phase-preserving nature of the filter.

Abstract

Conditional quantum optical processes enable a wide range of technologies from generation of highly non-classical states to implementation of quantum logic operations. The process fidelity that can be achieved in a realistic implementation depends on a number of system parameters. Here we experimentally examine Fock-state filtration, a canonical example of a broad class of conditional quantum operations acting on a single optical field mode. This operation is based upon interference of the mode to be manipulated with an auxiliary single-photon state at a beam splitter, resulting in the entanglement of the two output modes. A conditional projective measurement onto a single photon at one output mode heralds the success of the process. This operation, which implements a measurement-induced nonlinearity, is capable of suppressing particular photon-number probability amplitudes of an arbitrary quantum state. We employ coherent-state process tomography to determine the precise operation realized in our experiment. To identify the key sources of experimental imperfection, we develop a model of the process and identify three main contributions that significantly hamper its efficacy. The reconstructed tensor is compared with a model of the process taking into account sources of experimental imperfection with fidelity better than 0.95. This enables us to identify three key challenges to overcome in realizing a filter with high fidelity - namely the single-photon nature of the auxiliary state, high-mode overlap, and the need for number resolving detection when heralding. The results show that the filter does indeed exhibit a nonlinear response as a function of input photon number and preserves the phase relation between Fock layers of the output state, providing promise for future applications.