Initializing the flux state of multiwell inductively isolated Josephson junction qubits

Palomaki, Tauno; Dutta, S. K.; Paik, Hanhee; Xu, Huizhong; Matthews, J.; Lewis, Rupert; Ramos, Roberto; Mitra, Kaushik; Johnson, Philip R.; Strauch, Frederick W.; Dragt, Alex J.; Lobb, C. J.; Anderson, J. R.; Wellstood, F. C.

doi:10.1103/physrevb.73.014520

Cited by 24 publications

(10 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The devices were fabricated at Hypres, Inc., using a trilayer process 1 and the qubit junction had an area of (10µm) 2 . The SQUID was dynamically initialized to one of its metastable wells and simultaneously current-and flux-biased in such a way to study the properties of one of its junctions; further experimental details can be found in [17]. Microwave spectroscopy [2] performed on the device yielded single and two-photon transitions in quantitative agreement with quantum mechanical spectra of a single junction with parameters C = 4.46 pF and I c = 17.821 µA; a typical scan in frequency and bias current is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Strong-Field Effects in the Rabi Oscillations of the Superconducting Phase Qubit

Strauch

Dutta

Paik

et al. 2007

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

Abstract-Rabi oscillations have been observed in many superconducting devices, and represent prototypical logic operations for quantum bits (qubits) in a quantum computer. We use a three-level multiphoton analysis to understand the behavior of the superconducting phase qubit (current-biased Josephson junction) at high microwave drive power. Analytical and numerical results for the ac Stark shift, single-photon Rabi frequency, and twophoton Rabi frequency are compared to measurements made on a dc SQUID phase qubit with Nb/AlOx/Nb tunnel junctions. Good agreement is found between theory and experiment.

show abstract

Section: Methodsmentioning

confidence: 99%

Strong-Field Effects in the Rabi Oscillations of the Superconducting Phase Qubit

Strauch

Dutta

Paik

et al. 2007

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Äëÿ îáðîáêè çáå-ðåaeåíî¿ ³íôîðìàö³¿ âèêîðèñòîâóþòü âçàºìîä³þ íîñ³¿â öèõ âåëè÷èíè ïðè çáåðåaeåíí³ êâàíòîâî¿ êîãåðåíö³¿ [1][2][3]. ßê ïðàâèëî, íîñ³ÿìè êâàíòî-âàíèõ ô³çè÷íèõ âåëè÷èí º äâîñòàíîâ³ êâàíòîâ³ ñèñòåìè, ÿêèõ íàçèâàþòü êâàíòîâèìè êîì³ð-êàìè ïàì'ÿò³ àáî "êóá³òàìè" [4][5][6]. Áóäü-ÿêà äâîñòàíîâà êâàíòîâà ñèñòåìà, ÿêà ìîaeå áóòè àäðåñíà, êåðîâàíà, âèì³ðÿíà, îá'ºäíàíà ç ñóñ³-äàìè òà ³çîëüîâàíà â³ä äîâê³ëëÿ, º ïîòåíö³àëüíî êîðèñíîþ äëÿ êâàíòîâîãî îá÷èñëåííÿ ³ êâàíòî-âî¿ êîìóí³êàö³¿ [7][8][9].…”

Section: âñòóïunclassified

The Combined Method of Logical State Controlling of Criotrons Based on Squids

Tyhanskyi¹,

Partyka²

2009

SEMST

View full text Add to dashboard Cite

Àíîòàö³ÿ. Â ðîáîò³ âäîñêîíàëåíî ìàòåìàòè÷íó ìîäåëü ïåðåõ³äíèõ ïðîöåñ³â â äaeîçåô-ñîí³âñüêèõ åëåìåíòàõ ïàì'ÿò³ (êð³îòðîíàõ), ÿê³ ìîaeíà ñòâîðèòè íà îñíîâ³ íàäïðîâ³äíèõ êâàíòîâèõ ³íòåðôåðîìåòð³â (ÑÊÂ²Ä³â). Êð³îòðîíàìè ñëóaeèëè äâîêîíòàêòí³ ÑÊÂ²Äè, êåðó-âàííÿ ëîã³÷íèì ñòàíîì ÿêèõ áóëî äîñë³äaeåíî ìåòîäàìè ìàòåìàòè÷íîãî ìîäåëþâàííÿ. Íàìè çàïðîïîíîâàíî êîìá³íîâàíèé ñïîñ³á êåðóâàííÿ ëîã³÷íèì ñòàíîì òàêèõ êð³îòðîí³â, îñê³ëüêè ïðîñòèé ñïîñ³á êåðóâàííÿ çà äîïîìîãîþ ò³ëüêè ³ìïóëüñ³â ìàãí³òíîãî ïîòîêó íå çàáåçïå÷óº ñòàá³ëüíî¿ ðîáîòè êð³îòðîí³â ï³ä ÷àñ çâîðîòíèõ ëîã³÷íèõ ïåðåõîä³â "1" → "0". Ïîêàçàíî, ùî ïðÿì³ ëîã³÷í³ ïåðåõîäè "0" → "1" ìîaeíà åôåêòèâíî ðåàë³çóâàòè çà äîïîìîãîþ êåðóþ÷èõ ³ì-ïóëüñ³â ìàãí³òíîãî ïîòîêó, à ïåðåõîäè "1" → "0" -êåðóþ÷èõ ³ìïóëüñ³â ñòðóìó. Ðîçðàõîâàíî ïåðåõ³äí³ õàðàêòåðèñòèêè êð³îòðîí³â ï³ä ÷àñ ïðÿìèõ ³ çâîðîòíèõ ëîã³÷íèõ ïåðåõîä³â.Êëþ÷îâ³ ñëîâà: ÑÊÂ²Ä, êâàíòîâà êîì³ðêà ïàì'ÿò³, äaeîçåôñîí³âñüêèé êð³îòðîí, ïåðåõ³äíà õàðàêòåðèñòèêà, ëîã³÷íèé ïåðåõ³ä, íàäïðîâ³äíèé ³íòåðôåðîìåòð THE COMBINED METHOD OF LOGICAL STATE CONTROLLING OF CRIOTRONS BASED ON SQUIDS M. V. Tyhanskyi, A.I. PartykaAbstract. In the present work, we have improved the mathematical model of transition processes in Josephson memory cells (cryotrons), which can be created on the base of semiconductor quantum interferometers (SQUIDs). We employed two-contact SQUIDs to construct the cryotrons and investigated the possibilities to control the cryotrons' logical state by means of mathematical modeling. A combined method of logical state controlling of such cryotrons has been proposed since the simpler controlling method, where only impulses of magnetic flux are used, fails to provide stable operation of cryotrons during the inverse logical transitions "1" → "0". We show that the direct logical transitions "0" → "1" are effectively realized via controlling magnetic flux impulses whereas the transitions "1" → "0" are realized via controlling current impulses. Transition characteristics of the cryotrons during direct and inverse logical transitions are calculated.

show abstract

“…In computer technology, they are very attractive due to, first of all, their higher operational speed in comparison with traditional elements. Nowadays, the investigations aimed at developing super-high speed computer memory cells based on Josephson tunnel junctions are at the final stage [2,3,8,9,[10][11][12]. In our previous studies [14,15], we developed a mathematical model for Josephson cryotrons (JC) and calculated their transitional characteristics during the logical state switching controlled by external current impulses.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Transitional Processes in the Information Transformers — Josephson Cryotrons

Tyhanskyi

Krysko

Partyka

2009

SEMST

View full text Add to dashboard Cite

In the present work, we show that logical state controlling of Josephson memory cells (cryotrons) is possible not only by applying external current impulses, but also by means of magnetic flux impulses. By using methods of mathematical modeling, we studied transitional processes in cryotrons during the switching of their logical state and calculated transitional characteristics for the operational temperature T = 81,2 Ê. Peculiarities of the Josephson cryotrons' behavior and the effect of the variation of model parameters on direct logical transitions "0" → "1" and inverse logical transitions "1" → "0" are discussed.

show abstract

Initializing the flux state of multiwell inductively isolated Josephson junction qubits

Cited by 24 publications

References 16 publications

Strong-Field Effects in the Rabi Oscillations of the Superconducting Phase Qubit

Strong-Field Effects in the Rabi Oscillations of the Superconducting Phase Qubit

The Combined Method of Logical State Controlling of Criotrons Based on Squids

Modeling of Transitional Processes in the Information Transformers — Josephson Cryotrons

Contact Info

Product

Resources

About