Interfacing Superconducting Qubits with Cryogenic Logic: Readout

Caleb Howington, Alex Opremcak, Robert McDermott, Alex Kirichenko, Oleg A. Mukhanov, Britton Plourde

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

As superconducting quantum processors increase in size and complexity, the scalability of standard techniques for qubit control and readout becomes a limiting factor. Replacing room temperature analog components with cryogenic digital components could allow for the realization of systems well beyond the current state-of-The-Art qubit arrays with tens of qubits. The standard technique for performing a qubit measurement with heterodyne readout uses a quantum-limited cryogenic amplifier chain and requires bulky microwave components inside the refrigerator with multiple control lines and pump signals. Additionally, the result is only accessible in software at room temperature. An alternative method for measuring qubits involves mapping the qubit state onto the photon occupation in a microwave cavity, followed by subsequent photon detection using a Josephson photomultiplier (JPM). The JPM measures the qubit and stores the result in a classical circulating current. To make use of this result, we can leverage existing single flux quantum (SFQ) circuitry. An underdamped Josephson transmission line (JTL) can be coupled to the JPM and fluxons traveling along the JTL are accelerated or delayed, depending on the circulating current state of the JPM. This fluxon delay can then be converted to an SFQ logic signal resulting in a digital qubit readout with a proximal microfabricated device, paving the way for cryogenic digital feedback necessary for error-correcting codes.

Original languageEnglish (US)
Article number8680055
JournalIEEE Transactions on Applied Superconductivity
Volume29
Issue number5
DOIs
StatePublished - Aug 1 2019

Fingerprint

Photomultipliers
Cryogenics
cryogenics
logic
readout
transmission lines
error correcting codes
microwaves
Electric lines
Photons
Microwaves
refrigerators
photons
room temperature
Fluxes
occupation
central processing units
Refrigerators
amplifiers
analogs

Keywords

  • Josephson junctions
  • Superconducting devices
  • superconducting integrated circuits

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Interfacing Superconducting Qubits with Cryogenic Logic : Readout. / Howington, Caleb; Opremcak, Alex; McDermott, Robert; Kirichenko, Alex; Mukhanov, Oleg A.; Plourde, Britton.

In: IEEE Transactions on Applied Superconductivity, Vol. 29, No. 5, 8680055, 01.08.2019.

Research output: Contribution to journalArticle

Howington, Caleb ; Opremcak, Alex ; McDermott, Robert ; Kirichenko, Alex ; Mukhanov, Oleg A. ; Plourde, Britton. / Interfacing Superconducting Qubits with Cryogenic Logic : Readout. In: IEEE Transactions on Applied Superconductivity. 2019 ; Vol. 29, No. 5.
@article{7ae0369239c54d88a7f46c858eb77986,
title = "Interfacing Superconducting Qubits with Cryogenic Logic: Readout",
abstract = "As superconducting quantum processors increase in size and complexity, the scalability of standard techniques for qubit control and readout becomes a limiting factor. Replacing room temperature analog components with cryogenic digital components could allow for the realization of systems well beyond the current state-of-The-Art qubit arrays with tens of qubits. The standard technique for performing a qubit measurement with heterodyne readout uses a quantum-limited cryogenic amplifier chain and requires bulky microwave components inside the refrigerator with multiple control lines and pump signals. Additionally, the result is only accessible in software at room temperature. An alternative method for measuring qubits involves mapping the qubit state onto the photon occupation in a microwave cavity, followed by subsequent photon detection using a Josephson photomultiplier (JPM). The JPM measures the qubit and stores the result in a classical circulating current. To make use of this result, we can leverage existing single flux quantum (SFQ) circuitry. An underdamped Josephson transmission line (JTL) can be coupled to the JPM and fluxons traveling along the JTL are accelerated or delayed, depending on the circulating current state of the JPM. This fluxon delay can then be converted to an SFQ logic signal resulting in a digital qubit readout with a proximal microfabricated device, paving the way for cryogenic digital feedback necessary for error-correcting codes.",
keywords = "Josephson junctions, Superconducting devices, superconducting integrated circuits",
author = "Caleb Howington and Alex Opremcak and Robert McDermott and Alex Kirichenko and Mukhanov, {Oleg A.} and Britton Plourde",
year = "2019",
month = "8",
day = "1",
doi = "10.1109/TASC.2019.2908884",
language = "English (US)",
volume = "29",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "5",

}

TY - JOUR

T1 - Interfacing Superconducting Qubits with Cryogenic Logic

T2 - Readout

AU - Howington, Caleb

AU - Opremcak, Alex

AU - McDermott, Robert

AU - Kirichenko, Alex

AU - Mukhanov, Oleg A.

AU - Plourde, Britton

PY - 2019/8/1

Y1 - 2019/8/1

N2 - As superconducting quantum processors increase in size and complexity, the scalability of standard techniques for qubit control and readout becomes a limiting factor. Replacing room temperature analog components with cryogenic digital components could allow for the realization of systems well beyond the current state-of-The-Art qubit arrays with tens of qubits. The standard technique for performing a qubit measurement with heterodyne readout uses a quantum-limited cryogenic amplifier chain and requires bulky microwave components inside the refrigerator with multiple control lines and pump signals. Additionally, the result is only accessible in software at room temperature. An alternative method for measuring qubits involves mapping the qubit state onto the photon occupation in a microwave cavity, followed by subsequent photon detection using a Josephson photomultiplier (JPM). The JPM measures the qubit and stores the result in a classical circulating current. To make use of this result, we can leverage existing single flux quantum (SFQ) circuitry. An underdamped Josephson transmission line (JTL) can be coupled to the JPM and fluxons traveling along the JTL are accelerated or delayed, depending on the circulating current state of the JPM. This fluxon delay can then be converted to an SFQ logic signal resulting in a digital qubit readout with a proximal microfabricated device, paving the way for cryogenic digital feedback necessary for error-correcting codes.

AB - As superconducting quantum processors increase in size and complexity, the scalability of standard techniques for qubit control and readout becomes a limiting factor. Replacing room temperature analog components with cryogenic digital components could allow for the realization of systems well beyond the current state-of-The-Art qubit arrays with tens of qubits. The standard technique for performing a qubit measurement with heterodyne readout uses a quantum-limited cryogenic amplifier chain and requires bulky microwave components inside the refrigerator with multiple control lines and pump signals. Additionally, the result is only accessible in software at room temperature. An alternative method for measuring qubits involves mapping the qubit state onto the photon occupation in a microwave cavity, followed by subsequent photon detection using a Josephson photomultiplier (JPM). The JPM measures the qubit and stores the result in a classical circulating current. To make use of this result, we can leverage existing single flux quantum (SFQ) circuitry. An underdamped Josephson transmission line (JTL) can be coupled to the JPM and fluxons traveling along the JTL are accelerated or delayed, depending on the circulating current state of the JPM. This fluxon delay can then be converted to an SFQ logic signal resulting in a digital qubit readout with a proximal microfabricated device, paving the way for cryogenic digital feedback necessary for error-correcting codes.

KW - Josephson junctions

KW - Superconducting devices

KW - superconducting integrated circuits

UR - http://www.scopus.com/inward/record.url?scp=85065990323&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065990323&partnerID=8YFLogxK

U2 - 10.1109/TASC.2019.2908884

DO - 10.1109/TASC.2019.2908884

M3 - Article

AN - SCOPUS:85065990323

VL - 29

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 5

M1 - 8680055

ER -