Photon-assisted tunnelling of zero modes in a Majorana wire
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Photon-assisted tunnelling of zero modes in a Majorana wire. / van Zanten, David M. T.; Sabonis, Deividas; Suter, Judith; Vayrynen, Jukka I.; Karzig, Torsten; Pikulin, Dmitry I.; O'Farrell, Eoin C. T.; Razmadze, Davydas; Petersson, Karl D.; Krogstrup, Peter; Marcus, Charles M.
In: Nature Physics, Vol. 16, No. 6, 13.04.2020, p. 663-668.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Photon-assisted tunnelling of zero modes in a Majorana wire
AU - van Zanten, David M. T.
AU - Sabonis, Deividas
AU - Suter, Judith
AU - Vayrynen, Jukka I.
AU - Karzig, Torsten
AU - Pikulin, Dmitry I.
AU - O'Farrell, Eoin C. T.
AU - Razmadze, Davydas
AU - Petersson, Karl D.
AU - Krogstrup, Peter
AU - Marcus, Charles M.
PY - 2020/4/13
Y1 - 2020/4/13
N2 - Majorana bound states at the end of nanowires may be used for quantum computation if they can be coupled sufficiently strongly. Here, the Copenhagen lab show strong and tunable coupling, a step along the road towards devices.Hybrid nanowires with proximity-induced superconductivity in the topological regime host Majorana zero modes at their ends. Networks of such structures can produce topologically protected qubits where the fundamental energy scale is given by the inter-pair coupling E-M between the zero modes belonging to different wire segments. Here we report on the spectroscopic measurement of E-M in an InAs/Al double-island device by tracking the position of the microwave-induced quasiparticle excitations using a radiofrequency charge sensor. At zero magnetic field, photon-assisted tunnelling of Cooper pairs allows us to estimate the Josephson coupling between the islands. In the presence of a magnetic field aligned along the nanowire, we observe the 1e periodic excitation spectrum resulting from a zero-energy subgap state that emerges in a magnetic field. The discrete 1e periodic excitation spectrum is consistent with the coherent hybridization of single-electron states belonging to two opposite-parity branches. The dependence of excitation frequency on detuning indicates a sizable (GHz-scale) and controllable hybridization of zero modes across the junction separating islands, a requirement for applications related to Majorana-based qubits.
AB - Majorana bound states at the end of nanowires may be used for quantum computation if they can be coupled sufficiently strongly. Here, the Copenhagen lab show strong and tunable coupling, a step along the road towards devices.Hybrid nanowires with proximity-induced superconductivity in the topological regime host Majorana zero modes at their ends. Networks of such structures can produce topologically protected qubits where the fundamental energy scale is given by the inter-pair coupling E-M between the zero modes belonging to different wire segments. Here we report on the spectroscopic measurement of E-M in an InAs/Al double-island device by tracking the position of the microwave-induced quasiparticle excitations using a radiofrequency charge sensor. At zero magnetic field, photon-assisted tunnelling of Cooper pairs allows us to estimate the Josephson coupling between the islands. In the presence of a magnetic field aligned along the nanowire, we observe the 1e periodic excitation spectrum resulting from a zero-energy subgap state that emerges in a magnetic field. The discrete 1e periodic excitation spectrum is consistent with the coherent hybridization of single-electron states belonging to two opposite-parity branches. The dependence of excitation frequency on detuning indicates a sizable (GHz-scale) and controllable hybridization of zero modes across the junction separating islands, a requirement for applications related to Majorana-based qubits.
KW - STATES
U2 - 10.1038/s41567-020-0858-0
DO - 10.1038/s41567-020-0858-0
M3 - Journal article
VL - 16
SP - 663
EP - 668
JO - Nature Physics
JF - Nature Physics
SN - 1745-2473
IS - 6
ER -
ID: 247439314