Buidling a room temperature quantum computing grid
Eden Figueroa
Stony Brook University
 PhD student with Prof. A. I. Lvovsky in the Institute for Quantum Information Science at the University of Calgary, Canada Postdoc in the Quantum Dynamics Group of Prof. G. Rempe at the MaxPlanckInstitut für Quantenoptik in Garching, Germany Starting in 2013: Group leader of the Quantum Information Technology group at Stony Brook University
Abstract
Public interest in quantum technology is fueled by the vision of a quantum computer. The shift to having a grid of lowcost, scalable roomtemperature quantum memories and gates will make a lightbased quantum computer... [ view full abstract ]
Public interest in quantum technology is fueled by the vision of a quantum computer. The shift to having a grid of lowcost, scalable roomtemperature quantum memories and gates will make a lightbased quantum computer practical and economically feasible. While computational improvements through quantum computation are very promising, building a useful quantum computer is challenging because of the allornothing nature of quantum supremacy. In this presentation we discuss our progress towards building large arrays of roomtemperature quantum lightmatter interfaces.
The basis of this quantum grid are roomtemperature quantum lightmatter interfaces. We have demonstrated complete quantum memory operation for polarization qubits with average fidelities > 99% and the potential to operate with hundred microsecond lifetimes and 50% storage efficiency [1]. These systems can also be used for single photonlevel triggered phaseshifts operations at room temperature. We have characterized the quantum state of piphaseshifted singlephotonlevel pulses in a double lambda closedloop system. For particular choices in control field strength and input phase, the fidelity of the reconstructed quantum state can reach higher than 90% while having a piradians phase shift with respect to an original reference [2].
Furthermore, we have used our quantum lightmatter interfaces to implement an analog simulator of relativistic and topological physics. We have realized the JackiwRebbi model (JR). Our system was based upon interacting dark state polaritons (DSPs) created by storing light in a rubidium vapor using a dualtripod atomic system. We also probed the obtained topologically protected zero energymode by analyzing the time correlations between the spinor components. The DSPs temporal evolution emulates the physics of Dirac spinors and is engineered to follow the JR regime by using a linear magnetic field gradient [3].
Finally, we are currently scaling the number of qubits addressable within the roomtemperature system. We have engineered a 36rails light grid using rubidium tuned light in the form of single photon level pulses. We have performed singlephoton sensitive imaging of this light grid using a Tpx3Cam, allowing time and spatial stamping of incident photons. We will present preliminary results on the characterization of a grid of 36 quantum memories within a single rubidium cell. We will also discuss the envisioned functionalities of the quantum grid as an analog quantum simulator of molecular dynamics and as a multiqubit oneway quantum processing unit.
[1] Phys. Rev. Applied 8, 034023 (2017).
[2] arXiv:1803.07012 (2018).
[3] arXiv:1711.09346 (2017).
Authors

Mehdi Namazi
(Stony Brook University)

Steven Sagona
(Stony Brook University)

Reihaneh Shahrokhshahi
(Stony Brook University)

Bertus Jordaan
(Stony Brook University)

Changsuk Noh
(Korea Institute for Advanced Study)

Dimitris Angelakis
(Center for)

Andrei Nomerotski
(Brookhaven National Laboratory)

Eden Figueroa
(Stony Brook University)
Topic Areas
Quantum information processing and computing , Quantum simulation , Atom and ion trapping
Session
OS3bR236 » Quantum simulation & Quantum computing (16:40  Friday, 7th September, Room 236)
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