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| related topics |
| {measurement, state, measurements} |
| {information, entropy, channel} |
| {light, field, probe} |
| {energy, gaussian, time} |
| {bell, inequality, local} |
| {algorithm, log, probability} |
| {energy, state, states} |
| {field, particle, equation} |
| {spin, pulse, spins} |
| {qubit, qubits, gate} |
| {error, code, errors} |
| {equation, function, exp} |
|
Conservation laws, uncertainty relations, and quantum limits of
measurements
Masanao Ozawa
abstract: The uncertainty relation between the noise operator and the conserved
quantity leads to a bound for the accuracy of general measurements. The bound
extends the assertion by Wigner, Araki, and Yanase that conservation laws limit
the accuracy of ``repeatable'', or ``nondisturbing'', measurements to general
measurements, and improves the one previously obtained by Yanase for spin
measurements. The bound also sets an obstacle to making a small quantum
computer.
- oai_identifier:
- oai:arXiv.org:quant-ph/0112154
- categories:
- quant-ph
- comments:
- 4 pages, RevTex, to appear in PRL
- doi:
- 10.1103/PhysRevLett.88.050402
- arxiv_id:
- quant-ph/0112154
- journal_ref:
- Phys. Rev. Lett. 88, 050402(1--4) (2002).
- created:
- 2001-12-23
Full article ▸
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