scholarly journals Modular quantum memories using passive linear optics and coherent feedback

2015 ◽  
Vol 15 (11&12) ◽  
pp. 1017-1040
Author(s):  
Hendra I. Nurdin ◽  
John E. Gough
Keyword(s):  
Single Photon ◽  
Coupled System ◽  
Quantum Memory ◽  
Internal Mode ◽  
Linear Optics ◽  
Optical Fields ◽  
Optical Cavities ◽  
Modular Architectures ◽  
Memory Scheme ◽  
And Storage

In this paper, we show that quantum memory for qudit states encoded in a single photon pulsed optical field has a conceptually simple modular realization using only passive linear optics and coherent feedback. We exploit the idea that two decaying optical cavities can be coupled in a coherent feedback configuration to create an internal mode of the coupled system which is isolated and decoherence-free for the purpose of qubit storage. The qubit memory can then be switched between writing/read-out mode and storage mode simply by varying the routing of certain freely propagating optical fields in the network. It is then shown that the qubit memories can be interconnected with one another to form a qudit quantum memory. We explain each of the phase of writing, storage, and read-out for this modular quantum memory scheme. The results point a way towards modular architectures for complex compound quantum memories.

Implementation of a single-photon fully quantum router with cavity QED and linear optics

2021 ◽  
Vol 53 (1) ◽  
Author(s):  
Cong Cao ◽  
Yu-Hong Han ◽  
Xin Yi ◽  
Pan-Pan Yin ◽  
Xiu-Yu Zhang ◽  
...  
Keyword(s):  
Cavity Qed ◽  
Single Photon ◽  
Linear Optics ◽  
Quantum Router

scholarly journals Improving single photon sources via linear optics and photodetection

2004 ◽  
Author(s):  
Dominic W. Berry ◽  
Stefan Scheel ◽  
Casey R. Myers ◽  
Barry C. Sanders ◽  
Peter L. Knight ◽  
...  
Keyword(s):  
Single Photon ◽  
Linear Optics ◽  
Photon Sources

Entanglement of individual photon and atomic ensembles

2003 ◽  
Vol 3 (6) ◽  
pp. 627-634
Author(s):  
G.-P. Guo ◽  
G.-C. Guo
Keyword(s):  
Single Photon ◽  
Collective Excitations ◽  
Critical Element ◽  
Linear Optics ◽  
Atomic Ensembles ◽  
Photon Detectors ◽  
Present Scheme ◽  
Single Photon Detectors ◽  
Present Technique ◽  
Individual Photon

Here we present an experimentally feasible scheme to entangle flying qubit (individual photon with polarization modes) and stationary qubit (atomic ensembles with long-lived collective excitations). This entanglement integrating two different species can act as a critical element for the coherent transfer of quantum information between flying and stationary qubits. The entanglement degree can be also adjusted expediently with linear optics. Furthermore, the present scheme can be modified to generate this entanglement in a way event-ready, with the employment of a pair of entangled photons. And then successful preparation can be unambiguously heralded by coincident between two single-photon detectors. Its application for individual photons quantum memory is also analyzed. The physical requirements of all those preparation and applications processing are moderate, and well fit the present technique.

Efficient linear optics quantum computation

2001 ◽  
Vol 1 (Special) ◽  
pp. 13-19
Author(s):  
G.J. Milburn ◽  
T. Ralph ◽  
A. White ◽  
E. Knill ◽  
R. Laflamme
Keyword(s):  
Quantum Computation ◽  
Single Photon ◽  
Quantum Algorithms ◽  
Optical Nonlinearities ◽  
Linear Optics ◽  
Optical Elements ◽  
Particle Detectors ◽  
Feed Forward ◽  
Single Electrons ◽  
Photon Source

Two qubit gates for photons are generally thought to require exotic materials with huge optical nonlinearities. We show here that, if we accept two qubit gates that only work conditionally, single photon sources, passive linear optics and particle detectors are sufficient for implementing reliable quantum algorithms. The conditional nature of the gates requires feed-forward from the detectors to the optical elements. Without feed forward, non-deterministic quantum computation is possible. We discuss one proposed single photon source based on the surface acoustic wave guiding of single electrons.

scholarly journals Efficient quantum memory for single photon

2019 ◽  
Vol 64 (28-29) ◽  
pp. 2959-2960
Author(s):  
Chuanfeng Li
Keyword(s):  
Single Photon ◽  
Quantum Memory

scholarly journals A single-photon switch and transistor enabled by a solid-state quantum memory

Science ◽  
2018 ◽  
Vol 361 (6397) ◽  
pp. 57-60 ◽  
Author(s):  
Shuo Sun ◽  
Hyochul Kim ◽  
Zhouchen Luo ◽  
Glenn S. Solomon ◽  
Edo Waks
Keyword(s):  
Solid State ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Internal State ◽  
Optical Signal ◽  
Quantum Memory ◽  
Strong Interactions ◽  
Strongly Coupled ◽  
Spin Qubit ◽  
Photon Interactions

Single-photon switches and transistors generate strong photon-photon interactions that are essential for quantum circuits and networks. However, the deterministic control of an optical signal with a single photon requires strong interactions with a quantum memory, which has been challenging to achieve in a solid-state platform. We demonstrate a single-photon switch and transistor enabled by a solid-state quantum memory. Our device consists of a semiconductor spin qubit strongly coupled to a nanophotonic cavity. The spin qubit enables a single 63-picosecond gate photon to switch a signal field containing up to an average of 27.7 photons before the internal state of the device resets. Our results show that semiconductor nanophotonic devices can produce strong and controlled photon-photon interactions that could enable high-bandwidth photonic quantum information processing.

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