Do single-shot projective readouts necessarily estimate the $T_1$ lifetime ?
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866908883125010432 |
|---|---|
| author | Modak, Aparajita Kapila, Sundeep Weber, Bent Ensslin, Klaus Burkard, Guido Muralidharan, Bhaskaran |
| author_facet | Modak, Aparajita Kapila, Sundeep Weber, Bent Ensslin, Klaus Burkard, Guido Muralidharan, Bhaskaran |
| contents | When single-shot qubit readout protocols are adapted for multilevel systems, theoretical $T_1$ lifetime calculations often fall short of capturing the experimental lifetime trends. We identify extrinsic population dynamics as the fundamental origin of this disparity, establishing that the lifetime estimates can, in certain operating regions, be distinct from the intrinsic $T_1$ time. We clarify these aspects with an integrated theory to address recent measurements [Nat. Nano, 20, 494, (2025)] on spin-valley states in bilayer graphene. While confirming that phonon and Johnson noise are the dominant intrinsic sources, we show that the inclusion of extrinsic factors provide the critical match to the experimental estimates. The extrinsic factors also effectuate violations of generalized Mathiessen's rules. With an improved handle on the design space, a revised readout protocol to estimate the $T_1$ lifetime of the valley qubit is proposed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_10447 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Do single-shot projective readouts necessarily estimate the $T_1$ lifetime ? Modak, Aparajita Kapila, Sundeep Weber, Bent Ensslin, Klaus Burkard, Guido Muralidharan, Bhaskaran Mesoscale and Nanoscale Physics Quantum Physics When single-shot qubit readout protocols are adapted for multilevel systems, theoretical $T_1$ lifetime calculations often fall short of capturing the experimental lifetime trends. We identify extrinsic population dynamics as the fundamental origin of this disparity, establishing that the lifetime estimates can, in certain operating regions, be distinct from the intrinsic $T_1$ time. We clarify these aspects with an integrated theory to address recent measurements [Nat. Nano, 20, 494, (2025)] on spin-valley states in bilayer graphene. While confirming that phonon and Johnson noise are the dominant intrinsic sources, we show that the inclusion of extrinsic factors provide the critical match to the experimental estimates. The extrinsic factors also effectuate violations of generalized Mathiessen's rules. With an improved handle on the design space, a revised readout protocol to estimate the $T_1$ lifetime of the valley qubit is proposed. |
| title | Do single-shot projective readouts necessarily estimate the $T_1$ lifetime ? |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2603.10447 |