dorsal/arxiv
View SchemaThe manipulation of massive ro-vibronic superpositions using time-frequency-resolved coherent anti-Stokes Raman scattering (TFRCARS): from quantum control to quantum computing
| Authors | R. Zadoyan, D. Kohen, D. A. Lidar, V. A. Apkarian |
|---|---|
| Categories | |
| ArXiv ID | physics/0102091 |
| URL | https://arxiv.org/abs/physics/0102091 |
| DOI | 10.1016/S0301-0104(01)00270-1 |
| Journal | Chemical Physics 266, 323-351 (2001) |
Abstract
Molecular ro-vibronic coherences, joint energy-time distributions of quantum amplitudes, are selectively prepared, manipulated, and imaged in Time-Frequency-Resolved Coherent Anti-Stokes Raman Scattering (TFRCARS) measurements using femtosecond laser pulses. The studies are implemented in iodine vapor, with its thermally occupied statistical ro-vibrational density serving as initial state. The evolution of the massive ro-vibronic superpositions, consisting of 1000 eigenstates, is followed through two-dimensional images. The first- and second-order coherences are captured using time-integrated frequency-resolved CARS, while the third-order coherence is captured using time-gated frequency-resolved CARS. The Fourier filtering provided by time integrated detection projects out single ro-vibronic transitions, while time-gated detection allows the projection of arbitrary ro-vibronic superpositions from the coherent third-order polarization. Beside the control and imaging of chemistry, the controlled manipulation of massive quantum coherences suggests the possibility of quantum computing. We argue that the universal logic gates necessary for arbitrary quantum computing - all single qubit operations and the two-qubit controlled-NOT (CNOT) gate - are available in time resolved four-wave mixing in a molecule. The molecular rotational manifold is naturally "wired" for carrying out all single qubit operations efficiently, and in parallel. We identify vibronic coherences as one example of a naturally available two-qubit CNOT gate, wherein the vibrational qubit controls the switching of the targeted electronic qubit.
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"abstract": "Molecular ro-vibronic coherences, joint energy-time distributions of quantum\namplitudes, are selectively prepared, manipulated, and imaged in\nTime-Frequency-Resolved Coherent Anti-Stokes Raman Scattering (TFRCARS)\nmeasurements using femtosecond laser pulses. The studies are implemented in\niodine vapor, with its thermally occupied statistical ro-vibrational density\nserving as initial state. The evolution of the massive ro-vibronic\nsuperpositions, consisting of 1000 eigenstates, is followed through\ntwo-dimensional images. The first- and second-order coherences are captured\nusing time-integrated frequency-resolved CARS, while the third-order coherence\nis captured using time-gated frequency-resolved CARS. The Fourier filtering\nprovided by time integrated detection projects out single ro-vibronic\ntransitions, while time-gated detection allows the projection of arbitrary\nro-vibronic superpositions from the coherent third-order polarization. Beside\nthe control and imaging of chemistry, the controlled manipulation of massive\nquantum coherences suggests the possibility of quantum computing. We argue that\nthe universal logic gates necessary for arbitrary quantum computing - all\nsingle qubit operations and the two-qubit controlled-NOT (CNOT) gate - are\navailable in time resolved four-wave mixing in a molecule. The molecular\nrotational manifold is naturally \"wired\" for carrying out all single qubit\noperations efficiently, and in parallel. We identify vibronic coherences as one\nexample of a naturally available two-qubit CNOT gate, wherein the vibrational\nqubit controls the switching of the targeted electronic qubit.",
"arxiv_id": "physics/0102091",
"authors": [
"R. Zadoyan",
"D. Kohen",
"D. A. Lidar",
"V. A. Apkarian"
],
"categories": [
"physics.chem-ph",
"quant-ph"
],
"doi": "10.1016/S0301-0104(01)00270-1",
"journal_ref": "Chemical Physics 266, 323-351 (2001)",
"title": "The manipulation of massive ro-vibronic superpositions using time-frequency-resolved coherent anti-Stokes Raman scattering (TFRCARS): from quantum control to quantum computing",
"url": "https://arxiv.org/abs/physics/0102091"
},
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