Quantum Information Processing, Vol. 5, No. 5, October 2006 (© 2006)
Quantum Communication and Information Processing
with Quantum Dots
Received October 01, 2005; accepted December 29, 2005; Published online August 29, 2006
This paper reviews the single photon sources based on semiconductor quantum
dots and their applications to quantum information systems. By optically pumping
a system consisting of a semiconductor single quantum dot conﬁned in a mono-
lithic microcavity, it is possible to produce a single photon pulse stream at the
Fourier transform limit with a negligible jitter. This single photon source is not
only useful for BB84 quantum key distribution (QKD), but also ﬁnd applications
in other quantum information systems such as Ekert91/BBM92 QKD and quan-
tum teleportation gate linear optical quantum computers.
KEY WORDS: Single photon; quantum information; quantum indistinguish-
In BB84 Quantum key distribution (QKD),
the security of systems using
an ordinary Poisson light source can be threatened by an eavesdropper’s
photon splitting attack.
In the Ekert91 or BBM92 QKD using EPR-
Bell photon pairs,
additional bit errors occur due to the presence of
two or more photon pairs per pulse.
Hopes are therefore pinned on the
development of a light source that can generate single photons or single
EPR-Bell photon pairs at a deﬁnite time.
Schemes have been proposed for implementing photonic quantum
information processing techniques that are more advanced than QKD,
such as quantum teleportation,
and linear optics
For such applications, it is essential to generate a
large number of single photons at deﬁnite time instances that satisfy the
condition of “quantum indistinguishability.”
E. L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA.
National Institute of Informatics, Tokyo, Japan. E-mail: firstname.lastname@example.org
1570-0755/06/1000-0299/0 © 2006 Springer Science+Business Media, Inc.