Spectral Multiplexing for Scalable Quantum Photonics using an Atomic Freguency Comb Quantum Memory and Feed-Forward Control

• Published in: Physical review letters Vol. 113; no. 5
• Main Authors: Sinclair, Neil, Saglamyurek, Erhan, Mallahzadeh, Hassan, Slater, Joshua A, George, Mathew, Ricken, Raimund, Hedges, Morgan P, Oblak, Daniel, Simon, Christoph, Sohler, Wolfgang, Tittel, Wolfgang
• Format: Journal Article
• Language: English
• Published: 01-08-2014
• Subjects: Mapping; Modulators; Multiplexing; Photons; Qubits (quantum computing); Repeaters; Spectra; Stores
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.113.053603

Future multiphoton applications of quantum optics and quantum information science require quantum memories that simultaneously store many photon states, each encoded into a different optical mode, and enable one to select the mapping between any input and a specific retrieved mode during storage. Here we show, with the example of a quantum repeater, how to employ spectrally multiplexed states and memories with fixed storage times that allow such mapping between spectral modes. Furthermore, using a Ti:Tm:LiNbO3 waveguide cooled to 3 K, a phase modulator, and a spectral filter, we demonstrate storage followed by the required feed-forward-controlled frequency manipulation with time-bin qubits encoded into up to 26 multiplexed spectral modes and 97% fidelity.