Abstract
We transmit phase-encoded non-orthogonal quantum states through a 5-km long fibre-based distributed optical phase-sensitive amplifier (OPSA) using telecom-wavelength photonic qubit pairs. The gain is set to equal the transmission loss to probabilistically preserve input states during transmission. While neither state is optimally aligned to the OPSA, each input state is equally amplified with no measurable degradation in state quality. These results promise a new approach to reduce the effects of loss by encoding quantum information in a two-qubit Hilbert space which is designed to benefit from transmission through an OPSA.
Highlights
A two-qubit transmitter generates phase-encoded states that are transmitted through a 5-km long distributed Optical phase-sensitive amplifiers (OPSAs) followed by a two-qubit receiver for state analysis
The first interference effect was noted above, and is between the two-photon state amplitudes injected by the transmitter into the OPSA and the amplitude for pair generation in the OPSA
This effect is controlled at the transmitter by configuring the relative phases between the input two-photon state and the OPSA pump, as well as by setting the pump intensity appropriately
Summary
This effect is controlled at the transmitter by configuring the relative phases between the input two-photon state (signal and idler photons) and the OPSA pump, as well as by setting the pump intensity appropriately. The transmitter is used to set the signal and idler phases of each time-bin, relative to the pump, to produce a two-qubit state of the form:
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