Physics – Quantum Physics
Scientific paper
2005-07-20
J. Opt. B: Quantum Semiclass. Opt., 7, S245-S249, 2005
Physics
Quantum Physics
Scientific paper
10.1088/1464-4266/7/10/007
Photon counting induces an effective nonlinear optical phase shift on certain states derived by linear optics from single photons. Although this no nlinearity is nondeterministic, it is sufficient in principle to allow scalable linear optics quantum computation (LOQC). The most obvious way to encode a qubit optically is as a superposition of the vacuum and a single photon in one mode -- so-called "single-rail" logic. Until now this approach was thought to be prohibitively expensive (in resources) compared to "dual-rail" logic where a qubit is stored by a photon across two modes. Here we attack this problem with real-time feedback control, which can realize a quantum-limited phase measurement on a single mode, as has been recently demonstrated experimentally. We show that with this added measurement resource, the resource requirements for single-rail LOQC are not substantially different from those of dual-rail LOQC. In particular, with adaptive phase measurements an arbitrary qubit state $\alpha \ket{0} + \beta\ket{1}$ can be prepared deterministically.
Lund Austin P.
Ralph Timothy C.
Wiseman Howard M.
No associations
LandOfFree
Adaptive Phase Measurements in Linear Optical Quantum Computation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Adaptive Phase Measurements in Linear Optical Quantum Computation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive Phase Measurements in Linear Optical Quantum Computation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-491639