State-dependent linear-optical qubit amplifier

Optical Qubit Using Linear Elements

In recent years, the quantum engineering of light have received much attention, which is mainly motivated by the potential improvement offered by quantum mechanics to the manipulation and the transmission of information. In particular, some conditional schemes have been suggested to prepare superpositions. Among these we mention the Fock filtering by an active Fabry-Perot cavity [1], the displa...

Josephson amplifier for qubit readout

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Multiwavelength C+L band laser source using Linear Optical Amplifier

A scheme for generating multiwavelength laser source based on a linear optical amplifier (LOA) is demonstrated for potential applications in dense-wavelength division multiplexing (DWDM) communication systems. The laser output shows up to 80 laser lines (SNR at least 20 dB) with 0.4 nm channel spacing covering C and L band. Simultaneous tuning of muti-wavelengths is also demonstrated.

Experimental implementation of a quantum optical state comparison amplifier.

We present an experimental demonstration of a practical nondeterministic quantum optical amplification scheme that employs two mature technologies, state comparison and photon subtraction, to achieve amplification of known sets of coherent states with high fidelity. The amplifier uses coherent states as a resource rather than single photons, which allows for a relatively simple light source, su...

State-dependent impedance of a strongly coupled oscillator-qubit system