dorsal/arxiv
View SchemaA "Tipping Pulse" Scheme for rf-SQUID Qubits
| Authors | Xingxiang Zhou, Jonathan L. Habif, Mark F. Bocko, Marc J. Feldman |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0102090 |
| URL | https://arxiv.org/abs/quant-ph/0102090 |
| DOI | 10.1109/77.919522 |
Abstract
We introduce a technique to control the macroscopic quantum state of an rf SQUID qubit. We propose to employ a stream of single flux quantum (SFQ) pulses magnetically coupled to the qubit junction to momentarily suppresses its critical current. This effectively lowers the barrier in the double-well rf-SQUID potential thereby increasing the tunneling oscillation frequency between the wells. By carefully choosing the time interval between SFQ pulses one may accelerate the interwell tunneling rate. Thus it is possible to place the qubit into a chosen superposition of flux states and then effectively to freeze the qubit state. We present both numerical simulations and analytical time-dependent perturbation theory calculations that demonstrate the technique. Using this strategy one may control the quantum state of the rf-SQUID in a way analogous to the \pi pulses in other qubit schemes. Research supported in part by ARO grant # DAAG55-98-1-0367.
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"abstract": "We introduce a technique to control the macroscopic quantum state of an rf\nSQUID qubit. We propose to employ a stream of single flux quantum (SFQ) pulses\nmagnetically coupled to the qubit junction to momentarily suppresses its\ncritical current. This effectively lowers the barrier in the double-well\nrf-SQUID potential thereby increasing the tunneling oscillation frequency\nbetween the wells. By carefully choosing the time interval between SFQ pulses\none may accelerate the interwell tunneling rate. Thus it is possible to place\nthe qubit into a chosen superposition of flux states and then effectively to\nfreeze the qubit state. We present both numerical simulations and analytical\ntime-dependent perturbation theory calculations that demonstrate the technique.\nUsing this strategy one may control the quantum state of the rf-SQUID in a way\nanalogous to the \\pi pulses in other qubit schemes. Research supported in part\nby ARO grant # DAAG55-98-1-0367.",
"arxiv_id": "quant-ph/0102090",
"authors": [
"Xingxiang Zhou",
"Jonathan L. Habif",
"Mark F. Bocko",
"Marc J. Feldman"
],
"categories": [
"quant-ph"
],
"doi": "10.1109/77.919522",
"title": "A \"Tipping Pulse\" Scheme for rf-SQUID Qubits",
"url": "https://arxiv.org/abs/quant-ph/0102090"
},
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