Phase Diffusion in Low-<i>E<sub>J</sub></i> Josephson Junctions at Milli-Kelvin Temperatures
Josephson junctions (JJs) with Josephson energy <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>J</mi></msub><mo>≲</mo><mn>1</mn...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-01-01
|
| Series: | Electronics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-9292/12/2/416 |
| _version_ | 1797443463905542144 |
|---|---|
| author | Wen-Sen Lu Konstantin Kalashnikov Plamen Kamenov Thomas J. DiNapoli Michael E. Gershenson |
| author_facet | Wen-Sen Lu Konstantin Kalashnikov Plamen Kamenov Thomas J. DiNapoli Michael E. Gershenson |
| author_sort | Wen-Sen Lu |
| collection | DOAJ |
| description | Josephson junctions (JJs) with Josephson energy <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>J</mi></msub><mo>≲</mo><mn>1</mn></mrow></semantics></math></inline-formula> K are widely employed as non-linear elements in superconducting circuits for quantum computing operating at milli-Kelvin temperatures. In the qubits with small charging energy <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>C</mi></msub></semantics></math></inline-formula> ( <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>J</mi></msub><mo>/</mo><msub><mi>E</mi><mi>C</mi></msub><mo>≫</mo><mn>1</mn></mrow></semantics></math></inline-formula> ), such as the transmon, the incoherent phase slips (IPS) might become the dominant source of dissipation with decreasing <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>J</mi></msub></semantics></math></inline-formula>. In this work, a systematic study of the IPS in low-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>J</mi></msub></semantics></math></inline-formula> JJs at milli-Kelvin temperatures is reported. Strong suppression of the critical (switching) current and a very rapid growth of the zero-bias resistance due to the IPS are observed with decreasing <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>J</mi></msub></semantics></math></inline-formula> below 1 K. With further improvement of coherence of superconducting qubits, the observed IPS-induced dissipation might limit the performance of qubits based on low-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>J</mi></msub></semantics></math></inline-formula> junctions. These results point the way to future improvements of such qubits. |
| first_indexed | 2024-03-09T12:56:26Z |
| format | Article |
| id | doaj.art-f62d605218134db98c5bcba1ef6f3b5c |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-09T12:56:26Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-f62d605218134db98c5bcba1ef6f3b5c2023-11-30T22:00:09ZengMDPI AGElectronics2079-92922023-01-0112241610.3390/electronics12020416Phase Diffusion in Low-<i>E<sub>J</sub></i> Josephson Junctions at Milli-Kelvin TemperaturesWen-Sen Lu0Konstantin Kalashnikov1Plamen Kamenov2Thomas J. DiNapoli3Michael E. Gershenson4Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USADepartment of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USADepartment of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USADepartment of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USADepartment of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USAJosephson junctions (JJs) with Josephson energy <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>J</mi></msub><mo>≲</mo><mn>1</mn></mrow></semantics></math></inline-formula> K are widely employed as non-linear elements in superconducting circuits for quantum computing operating at milli-Kelvin temperatures. In the qubits with small charging energy <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>C</mi></msub></semantics></math></inline-formula> ( <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>J</mi></msub><mo>/</mo><msub><mi>E</mi><mi>C</mi></msub><mo>≫</mo><mn>1</mn></mrow></semantics></math></inline-formula> ), such as the transmon, the incoherent phase slips (IPS) might become the dominant source of dissipation with decreasing <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>J</mi></msub></semantics></math></inline-formula>. In this work, a systematic study of the IPS in low-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>J</mi></msub></semantics></math></inline-formula> JJs at milli-Kelvin temperatures is reported. Strong suppression of the critical (switching) current and a very rapid growth of the zero-bias resistance due to the IPS are observed with decreasing <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>J</mi></msub></semantics></math></inline-formula> below 1 K. With further improvement of coherence of superconducting qubits, the observed IPS-induced dissipation might limit the performance of qubits based on low-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mi>J</mi></msub></semantics></math></inline-formula> junctions. These results point the way to future improvements of such qubits.https://www.mdpi.com/2079-9292/12/2/416superconductingJosephson junctionphase slipcritical currentJosephson energyquantum |
| spellingShingle | Wen-Sen Lu Konstantin Kalashnikov Plamen Kamenov Thomas J. DiNapoli Michael E. Gershenson Phase Diffusion in Low-<i>E<sub>J</sub></i> Josephson Junctions at Milli-Kelvin Temperatures Electronics superconducting Josephson junction phase slip critical current Josephson energy quantum |
| title | Phase Diffusion in Low-<i>E<sub>J</sub></i> Josephson Junctions at Milli-Kelvin Temperatures |
| title_full | Phase Diffusion in Low-<i>E<sub>J</sub></i> Josephson Junctions at Milli-Kelvin Temperatures |
| title_fullStr | Phase Diffusion in Low-<i>E<sub>J</sub></i> Josephson Junctions at Milli-Kelvin Temperatures |
| title_full_unstemmed | Phase Diffusion in Low-<i>E<sub>J</sub></i> Josephson Junctions at Milli-Kelvin Temperatures |
| title_short | Phase Diffusion in Low-<i>E<sub>J</sub></i> Josephson Junctions at Milli-Kelvin Temperatures |
| title_sort | phase diffusion in low i e sub j sub i josephson junctions at milli kelvin temperatures |
| topic | superconducting Josephson junction phase slip critical current Josephson energy quantum |
| url | https://www.mdpi.com/2079-9292/12/2/416 |
| work_keys_str_mv | AT wensenlu phasediffusioninlowiesubjsubijosephsonjunctionsatmillikelvintemperatures AT konstantinkalashnikov phasediffusioninlowiesubjsubijosephsonjunctionsatmillikelvintemperatures AT plamenkamenov phasediffusioninlowiesubjsubijosephsonjunctionsatmillikelvintemperatures AT thomasjdinapoli phasediffusioninlowiesubjsubijosephsonjunctionsatmillikelvintemperatures AT michaelegershenson phasediffusioninlowiesubjsubijosephsonjunctionsatmillikelvintemperatures |