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Qubit readout with the Josephson Pho...

The University of Wisconsin - Madison., Physics.

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Qubit readout with the Josephson Photomultiplier.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Qubit readout with the Josephson Photomultiplier./
作者:	Ribeill, Guilhem.
面頁冊數:	199 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.
Contained By:	Dissertation Abstracts International77-08B(E).
標題:	Quantum physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10077441
ISBN:	9781339589008

Qubit readout with the Josephson Photomultiplier.
Ribeill, Guilhem.

Qubit readout with the Josephson Photomultiplier. - 199 p.

Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2016.

Recent demonstrations of error correction in many qubit circuits, as well as efforts to build a logical qubit, have shown the need for a simple and scalable superconducting quantum bit (qubit) readout. Current solutions based on heterodyne detection and cryogenic amplification of microwave readout tones may prove difficult to scale, while photon counting presents an attractive alternative. However, the development of counters operating at these frequencies has proved technically challenging. In this thesis, we describe the development of the Josephson Photomultiplier (JPM), a microwave photon counting circuit. We discuss the JPM theoretically, and describe the fabrication of the JPM using standard thin film lithography techniques. We measure its properties as a microwave photon counter using a qubit as an in-situ calibrated source of photons. We measure a JPM quantum efficiency at the few percent level. We then use the JPM to perform readout of a transmon qubit in both the dispersive and bright regimes. We observe raw measurement fidelities of 35% and 62% respectively. We discuss how the JPM and measurement protocol could be further optimized to achieve fidelities in excess of 90%.

ISBN: 9781339589008Subjects--Topical Terms:

726746
Quantum physics.

Qubit readout with the Josephson Photomultiplier.
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