|
| related topics |
| {photon, photons, single} |
| {state, phys, rev} |
| {measurement, state, measurements} |
| {qubit, qubits, gate} |
| {light, field, probe} |
| {state, states, coherent} |
| {entanglement, phys, rev} |
| {particle, mechanics, theory} |
| {information, entropy, channel} |
|
Measuring a photonic qubit without destroying it
G. J. Pryde, J. L. O'Brien, A. G. White, S. D. Bartlett, T. C. Ralph
abstract: Measuring the polarisation of a single photon typically results in its
destruction. We propose, demonstrate, and completely characterise a
\emph{quantum non-demolition} (QND) scheme for realising such a measurement
non-destructively. This scheme uses only linear optics and photo-detection of
ancillary modes to induce a strong non-linearity at the single photon level,
non-deterministically. We vary this QND measurement continuously into the weak
regime, and use it to perform a non-destructive test of complementarity in
quantum mechanics. Our scheme realises the most advanced general measurement of
a qubit: it is non-destructive, can be made in any basis, and with arbitrary
strength.
- oai_identifier:
- oai:arXiv.org:quant-ph/0312048
- categories:
- quant-ph
- comments:
- 4 pages, 3 figures
- doi:
- 10.1103/PhysRevLett.92.190402
- arxiv_id:
- quant-ph/0312048
- journal_ref:
- Phys.Rev.Lett.92:190402,2004
- created:
- 2003-12-05
Full article ▸
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