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Your search keyword '"Namazi, Mehdi"' showing total 2 results
Start Over Author "Namazi, Mehdi" Publisher american physical society
2 results on '"Namazi, Mehdi"'

1. Cascading quantum light-matter interfaces with minimal interconnection losses.

Author

Namazi, Mehdi, Mittiga, Thomas, Kupchak, Connor, and Figueroa, Eden

Subjects
*QUANTUM information science, *PHOTONS, *OPTICAL lattices, *QUANTUM theory, *INTEGRATED circuit interconnections
Abstract

The ability to interface multiple optical quantum devices is a key milestone towards the development of future quantum information processors and networks. One of the requirements for any of their constituent elements will be cascadability, i.e., the ability to drive the input of a device using the output of another one. Here, we report the cascading of quantum light-matter interfaces by storing few-photon level pulses of light in warm vapor followed by the subsequent storage of the retrieved field onto a second ensemble. We demonstrate that by using built-in purification mechanisms in the sequential storage, the final signal-to-background ratio can remain greater than one for weak pulses containing eight input photons on average. [ABSTRACT FROM AUTHOR]

Published
2015
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2. Conditional π-Phase Shift of Single-Photon-Level Pulses at Room Temperature.

Author

Sagona-Stophel, Steven, Shahrokhshahi, Reihaneh, Jordaan, Bertus, Namazi, Mehdi, and Figueroa, Eden

Subjects
*PHOTON-photon interactions, *COHERENT states, *QUANTUM information science, *FOUR-wave mixing, *QUANTUM statistics, *QUANTUM states, *QUANTUM logic
Abstract

The development of useful photon-photon interactions can trigger numerous breakthroughs in quantum information science, however, this has remained a considerable challenge spanning several decades. Here, we demonstrate the first room-temperature implementation of large phase shifts (≈π) on a single-photon level probe pulse (1.5 µs) triggered by a simultaneously propagating few-photon-level signal field. This process is mediated by Rb87 vapor in a double-Λ atomic configuration. We use homodyne tomography to obtain the quadrature statistics of the phase-shifted quantum fields and perform maximum-likelihood estimation to reconstruct their quantum state in the Fock state basis. For the probe field, we have observed input-output fidelities higher than 90% for phase-shifted output states, and high overlap (over 90%) with a theoretically perfect coherent state. Our noise-free, four-wave-mixing-mediated photon-photon interface is a key milestone toward developing quantum logic and nondemolition photon detection using schemes such as coherent photon conversion. [ABSTRACT FROM AUTHOR]

Published
2020
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