Imperfect Detectors in Linear Optical Quantum Computers
نویسنده
چکیده
We discuss the effects of imperfect photon detectors suffering from loss and noise on the reliability of linear optical quantum computers. We show that for a given detector efficiency, there is a maximum achievable success probability, and that increasing the number of ancillary photons and detectors used for one controlled sign flip gate beyond a critical point will decrease the probability that the computer will function correctly. We have also performed simulations of some small logic gates and estimate the efficiency and noise levels required for the linear optical quantum computer to function properly.
منابع مشابه
How good must single photon sources and detectors be for efficient linear optical quantum computation?
We present a scheme for linear optical quantum computation that is highly robust to imperfect single photon sources and inefficient detectors. In particular we show that if the product of the detector efficiency with the source efficiency is greater than 2/3, then efficient linear optical quantum computation is possible. This high threshold is achieved within the cluster state paradigm for quan...
متن کاملProposed Experiment in Two-qubit Linear Optical Photonic Gates for Maximal Success Rates
Here we propose an experiment in linear optical quantum computing (LOQC) using the framework first developed by Knill, Laflamme and Milburn. This experiment will test the ideas of the authors’ previous work on imperfect LOQC gates using number-resolving photon detectors. We suggest a relatively simple physical apparatus capable of producing CZ gates with controllable fidelity less than 1 and su...
متن کاملLinear-optical implementations of the iSWAP and controlled NOT gates based on conventional detectors
The majority of linear-optical nondestructive implementations of universal quantum gates are based on single-photon resolving detectors. We propose two implementations, which are nondestructive (i.e., destroying only ancilla states) and work with conventional detectors (i.e., those which do not resolve number of photons). Moreover, we analyze a recently proposed scheme of Wang et al. [J. Opt. S...
متن کاملA scheme for ef®cient quantum computation with linear optics
Quantum computers promise to increase greatly the ef®ciency of solving problems such as factoring large integers, combinatorial optimization and quantum physics simulation. One of the greatest challenges now is to implement the basic quantumcomputational elements in a physical system and to demonstrate that they can be reliably and scalably controlled. One of the earliest proposals for quantum ...
متن کاملEquivalent efficiency of a simulated photon-number detector
Homodyne detection is considered as a way to improve the efficiency of communication near the singlephoton level. The current lack of commercially available infrared photon-number detectors significantly reduces the mutual information accessible in such a communication channel. We consider simulating direct detection via homodyne detection. We find that our particular simulated direct detection...
متن کامل