dorsal/arxiv
View SchemaDemonstration of Feed-Forward Control for Linear Optics Quantum Computation
| Authors | T. B. Pittman, B. C. Jacobs, J. D. Franson |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0204142 |
| URL | https://arxiv.org/abs/quant-ph/0204142 |
| DOI | 10.1103/PhysRevA.66.052305 |
| Journal | Phys. Rev. A 66, 052305 (2002). |
Abstract
One of the main requirements in linear optics quantum computing is the ability to perform single-qubit operations that are controlled by classical information fed forward from the output of single photon detectors. These operations correspond to pre-determined combinations of phase corrections and bit-flips that are applied to the post-selected output modes of non-deterministic quantum logic devices. Corrections of this kind are required in order to obtain the correct logical output for certain detection events, and their use can increase the overall success probability of the devices. In this paper, we report on the experimental demonstration of the use of this type of feed-forward system to increase the probability of success of a simple non-deterministic quantum logic operation from approximately 1/4 to 1/2. This logic operation involves the use of one target qubit and one ancilla qubit which, in this experiment, are derived from a parametric down-conversion photon pair. Classical information describing the detection of the ancilla photon is fed-forward in real-time and used to alter the quantum state of the output photon. A fiber optic delay line is used to store the output photon until a polarization-dependent phase shift can be applied using a high speed Pockels cell.
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"abstract": "One of the main requirements in linear optics quantum computing is the\nability to perform single-qubit operations that are controlled by classical\ninformation fed forward from the output of single photon detectors. These\noperations correspond to pre-determined combinations of phase corrections and\nbit-flips that are applied to the post-selected output modes of\nnon-deterministic quantum logic devices. Corrections of this kind are required\nin order to obtain the correct logical output for certain detection events, and\ntheir use can increase the overall success probability of the devices. In this\npaper, we report on the experimental demonstration of the use of this type of\nfeed-forward system to increase the probability of success of a simple\nnon-deterministic quantum logic operation from approximately 1/4 to 1/2. This\nlogic operation involves the use of one target qubit and one ancilla qubit\nwhich, in this experiment, are derived from a parametric down-conversion photon\npair. Classical information describing the detection of the ancilla photon is\nfed-forward in real-time and used to alter the quantum state of the output\nphoton. A fiber optic delay line is used to store the output photon until a\npolarization-dependent phase shift can be applied using a high speed Pockels\ncell.",
"arxiv_id": "quant-ph/0204142",
"authors": [
"T. B. Pittman",
"B. C. Jacobs",
"J. D. Franson"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.66.052305",
"journal_ref": "Phys. Rev. A 66, 052305 (2002).",
"title": "Demonstration of Feed-Forward Control for Linear Optics Quantum Computation",
"url": "https://arxiv.org/abs/quant-ph/0204142"
},
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