dorsal/arxiv
View SchemaLight-Shift Imbalance Induced Blockade of Collective Excitations Beyond the Lowest Order
| Authors | M. S. Shahriar, P. Pradhan, G. S. Pati, V. Gopal, K. Salit |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0604120 |
| URL | https://arxiv.org/abs/quant-ph/0604120 |
| DOI | 10.1016/j.optcom.2007.05.057 |
Abstract
Current proposals focusing on neutral atoms for quantum computing are mostly based on using single atoms as quantum bits (qubits), while using cavity induced coupling or dipole-dipole interaction for two-qubit operations. An alternative approach is to use atomic ensembles as qubits. However, when an atomic ensemble is excited, by a laser beam matched to a two-level transition (or a Raman transition) for example, it leads to a cascade of many states as more and more photons are absorbed^1. In order to make use of an ensemble as a qubit, it is necessary to disrupt this cascade, and restrict the excitation to the absorption (and emission) of a single photon only. Here, we show how this can be achieved by using a new type of blockade mechanism, based on the light-shift imbalance (LSI) in a Raman transition. We describe first a simple example illustrating the concept of light shift imbalanced induced blockade (LSIIB) using a multi-level structure in a single atom, and show verifications of the analytic prediction using numerical simulations. We then extend this model to show how a blockade can be realized by using LSI in the excitation of an ensemble. Specifically, we show how the LSIIB process enables one to treat the ensemble as a two level atom that undergoes fully deterministic Rabi oscillations between two collective quantum states, while suppressing excitations of higher order collective states.
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"abstract": "Current proposals focusing on neutral atoms for quantum computing are mostly\nbased on using single atoms as quantum bits (qubits), while using cavity\ninduced coupling or dipole-dipole interaction for two-qubit operations. An\nalternative approach is to use atomic ensembles as qubits. However, when an\natomic ensemble is excited, by a laser beam matched to a two-level transition\n(or a Raman transition) for example, it leads to a cascade of many states as\nmore and more photons are absorbed^1. In order to make use of an ensemble as a\nqubit, it is necessary to disrupt this cascade, and restrict the excitation to\nthe absorption (and emission) of a single photon only. Here, we show how this\ncan be achieved by using a new type of blockade mechanism, based on the\nlight-shift imbalance (LSI) in a Raman transition. We describe first a simple\nexample illustrating the concept of light shift imbalanced induced blockade\n(LSIIB) using a multi-level structure in a single atom, and show verifications\nof the analytic prediction using numerical simulations. We then extend this\nmodel to show how a blockade can be realized by using LSI in the excitation of\nan ensemble. Specifically, we show how the LSIIB process enables one to treat\nthe ensemble as a two level atom that undergoes fully deterministic Rabi\noscillations between two collective quantum states, while suppressing\nexcitations of higher order collective states.",
"arxiv_id": "quant-ph/0604120",
"authors": [
"M. S. Shahriar",
"P. Pradhan",
"G. S. Pati",
"V. Gopal",
"K. Salit"
],
"categories": [
"quant-ph"
],
"doi": "10.1016/j.optcom.2007.05.057",
"title": "Light-Shift Imbalance Induced Blockade of Collective Excitations Beyond the Lowest Order",
"url": "https://arxiv.org/abs/quant-ph/0604120"
},
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